SECURITIES & EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G
(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
PURSUANT TO 13d-2(b)

(Amendment No.1)*

MENTOR CORPORATION
(Name of Issuer)

Common Stock, $0.10 par value per share
(Title of Class of Securities)

587188103
(CUSIP Number)

December 31, 2008
(Date of event which requires filing of this statement)

Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

[ ] Rule 13d-1(b)
[x] Rule 13d-1(c)
[ ] Rule 13d-1(d)

(Page 1 of 20 Pages)

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).


CUSIP No. 587188103 13G/A Page 2 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 HealthCor Management, L.P.

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
 20-2893581
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Delaware
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON **
 PN
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 3 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 HealthCor Associates, LLC

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
 20-2891849
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Delaware
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON **
 OO - limited liability company
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 4 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 HealthCor Offshore, Ltd.

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Cayman Islands
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON **
 OO - limited company
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 5 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 HealthCor Offshore Master Fund, L.P.

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Cayman Islands
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON **
 OO - limited company
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 6 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 HealthCor Offshore GP, LLC

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Cayman Islands
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON **
 OO - limited company
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 7 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 HealthCor Hybrid Offshore, Ltd.

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Cayman Islands
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON **
 OO - limited company
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 8 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 HealthCor Hybrid Offshore Master Fund, L.P.

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON **
 OO - limited company
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 9 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 HealthCor Hybrid Offshore GP, LLC

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Cayman Islands
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON **
 OO - limited company
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 10 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 HealthCor Group, LLC

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
 51-0551771
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 xDelaware
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON **
 OO - limited liability company
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 11 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 HealthCor Capital, L.P.

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
 51-0551770
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE
 BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Delaware
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON ** PN
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 12 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 HealthCor, L.P.

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
 20-3240266
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON **
 PN
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 13 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 Arthur Cohen

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 United States
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0

SHARES --------------------------------------------------------------
`
BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON ** IN
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 14 of 20 Pages


-----------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS
 Joseph Healey

 I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
-----------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
 (a) [X]
 (b) [ ]
-----------------------------------------------------------------------------
 (3) SEC USE ONLY
-----------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 United States
-----------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
 0
SHARES --------------------------------------------------------------

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY --------------------------------------------------------------

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING --------------------------------------------------------------

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
-----------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 0
-----------------------------------------------------------------------------
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
-----------------------------------------------------------------------------
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0.00%
-----------------------------------------------------------------------------
 (12) TYPE OF REPORTING PERSON **
 IN
-----------------------------------------------------------------------------
 ** SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 587188103 13G/A Page 15 of 20 Pages


Item 1(a). Name of Issuer:
 Mentor Corporation

Item 1(b). Address of Issuer's Principal Executive Offices:
 201 Mentor Drive
 Santa Barbara, California 93111


Item 2(a, b, c). Name of Person Filing:

 (i) HealthCor Management, L.P., a Delaware limited partnership;
 Carnegie Hall Tower, 152 West 57th Street, 47th Floor, New York,
 New York 10019;

 (ii) HealthCor Associates, LLC, a Delaware limited liability
 company, Carnegie Hall Tower, 152 West 57th Street, 47th Floor,
 New York, New York 10019;

 (iii) HealthCor Offshore, Ltd., a Cayman Islands limited company,
 Carnegie Hall Tower, 152 West 57th Street, 47th Floor, New York,
 New York 10019;

 (iv) HealthCor Offshore Master Fund, L.P., a Cayman Islands
 limited partnership, Carnegie Hall Tower, 152 West 57th Street,
 47th Floor, New York, New York 10019;

 (v) HealthCor Offshore GP, LLC, a Delaware limited liability
 company, Carnegie Hall Tower, 152 West 57th Street, 47th Floor,
 New York, New York 10019;

 (vi) HealthCor Hybrid Offshore, Ltd., a Cayman Islands limited
 company, Carnegie Hall Tower, 152 West 57th Street, 47th Floor,
 New York, New York 10019;

 (vii) HealthCor Hybrid Offshore Master Fund, L.P., a Cayman
 Islands limited partnership, Carnegie Hall Tower, 152 West 57th
 Street, 47th Floor, New York, New York 10019;

 (viii) HealthCor Hybrid Offshore GP, LLC, a Delaware limited
 liability company, Carnegie Hall Tower, 152 West 57th Street,
 47th Floor, New York, New York 10019;

 (ix) HealthCor Group, LLC, a Delaware limited liability company,
 Carnegie Hall Tower, 152 West 57th Street, 47th Floor, New York,
 New York 10019;

 (x) HealthCor Capital, L.P., a Delaware limited partnership,
 Carnegie Hall Tower, 152 West 57th Street, 47th Floor, New York,
 New York 10019;

 (xi) HealthCor, L.P., a Delaware limited partnership, Carnegie
 Hall Tower, 152 West 57th Street, 47th Floor, New York, New York
 10019;


CUSIP No. 587188103 13G/A Page 16 of 20 Pages


 (xii) Joseph Healey; Carnegie Hall Tower, 152 West 57th Street,
 47th Floor, New York, New York 10019; and

 (xiii) Arthur Cohen, 12 South Main Street, #203 Norwalk, Ct
 06854.

 Both Mr. Healey and Mr. Cohen are United States citizens.

 The persons at (i) through (xiii) above are collectively referred
 to herein as the "Reporting Persons".

Item 2(d). Title of Class of Securities: common stock, par value $.01 per
 share (the "Common Stock")

Item 2(e). CUSIP Number: 587188103


Item 3. Not applicable.

Item 4. Ownership.

 The information required by Items 4(a) - (c) is set forth in Rows 5
 - 11 of the cover page for each Reporting Person hereto and is
 incorporated herein by reference for each such Reporting Person.
 Holdings of Common Stock are as of February 6, 2009.

 Collectively, HealthCor, L.P., Healthcor Offshore Master Fund, L.P.
 and HealthCor Hybrid Offshore Master Fund, L.P. (each a "Fund" and
 together, the "Funds") are the beneficial owners of a total of 0
 shares of the Common Stock of the Issuer. By virtue of their
 position as feeder funds, HealthCor Offshore, Ltd. and HealthCor
 Hybrid Offshore, Ltd. may be deemed beneficial owners of the shares
 of Common Stock owned by HealthCor Offshore Master Fund, L.P., and
 HealthCor Hybrid Offshore Master Fund, L.P., respectively.

 HealthCor Offshore GP, LLC is the general partner of HealthCor
 Offshore Master Fund, L.P. Accordingly, HealthCor Offshore GP, LLC
 may be deemed to beneficially own the shares of Common Stock that
 are beneficially owned by HealthCor Offshore Master Fund, L.P.
 HealthCor Group, LLC is the general partner of HealthCor Offshore
 GP, LLC and, therefore, may be deemed to beneficially own the shares
 of Common Stock that are beneficially owned by HealthCor Offshore
 Master Fund, L.P.

 HealthCor Hybrid Offshore GP, LLC is the general partner of
 HealthCor Hybrid Offshore Master Fund, L.P. Accordingly, HealthCor
 Hybrid Offshore GP, LLC may be deemed to beneficially own the shares
 of Common Stock that are beneficially owned by HealthCor Hybrid
 Offshore Master Fund, L.P. HealthCor Group, LLC is the general
 partner of HealthCor Hybrid Offshore GP, LLC and, therefore, may be
 deemed to beneficially own the shares of Common Stock that are
 beneficially owned by HealthCor Hybrid Offshore Master Fund, L.P.

 By virtue of its position as the investment manager of the Funds,
 HealthCor Management, L.P. may be deemed a beneficial owner of all


CUSIP No. 587188103 13G/A Page 17 of 20 Pages

 the shares of Common Stock owned by the Funds. HealthCor Associates,
 LLC is the general partner of HealthCor Management, L.P. and thus
 may also be deemed to beneficially own the shares of Common Stock
 that are beneficially owned by the Funds.

 HealthCor Group LLC is the general partner of HealthCor Capital,
 L.P., which is in turn the general partner of HealthCor, L.P.
 Accordingly, each of HealthCor Capital L.P. and HealthCor Group, LLC
 may be deemed to beneficially own the shares of Common Stock that
 are beneficially owned by HealthCor, L.P.

 As the Managers of HealthCor Associates, LLC, Arthur Cohen and
 Joseph Healey exercise both voting and investment power with respect
 to the shares of Common Stock reported herein, and therefore each
 may be deemed a beneficial owner of such Common Stock.

 Each of the Reporting Persons hereby disclaims any beneficial
 ownership of any such Shares in excess of their actual pecuniary
 interest therein.


Item 5. Ownership of Five Percent or Less of a Class:

 If this statement is being filed to report the fact that as of the
date hereof the reporting person has ceased to be the beneficial owner of more
than five percent of the class of securities, check the following [x].

Item 6. Ownership of More than Five Percent on Behalf of Another Person.
 Not Applicable

Item 7. Identification and Classification of the Subsidiary Which Acquired
 the Security Being Reported on by the Parent Holding Company.
 Not Applicable

Item 8. Identification and Classification of Members of the Group.
 Not Applicable

Item 9. Notice of Dissolution of Group.
 Not Applicable


CUSIP No. 587188103 13G/A Page 18 of 20 Pages

Item 10. Certification.

 By signing below I certify that, to the best of my knowledge and
 belief, the securities referred to above were not acquired and are
 not held for the purpose of or with the effect of changing or
 influencing the control of the issuer of the securities and were not
 acquired and are not held in connection with or as a participant in
 any transaction having that purpose or effect.

Exhibits:

Exhibit I: Joint Acquisition Statement, dated as of February 17, 2009.


CUSIP No. 587188103 13G/A Page 19 of 20 Pages

 SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

DATED: February 17, 2009

 HEALTHCOR MANAGEMENT, L.P., for itself and
 as manager on behalf of (i) HEALTHCOR OFFSHORE, LTD.
 and (ii) HEALTHCOR HYBRID OFFSHORE, LTD.

 By: HealthCor Associates, LLC, its general partner

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel

 HEALTHCOR CAPITAL, L.P., for itself and as general partner on behalf
 of EALTHCOR L.P.

 By: HealthCor Group, LLC, its general partner

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel

 HEALTHCOR OFFSHORE GP, LLC, for itself and as general partner of
 behalf of HEALTHCOR OFFSHORE MASTER FUND, L.P.


 By: HealthCor Group, LLC, its general partner

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel

 HEALTHCOR HYBRID OFFSHORE GP, LLC, for itself and as general partner
 of behalf of HEALTHCOR HYBRID OFFSHORE MASTER FUND, L.P.


 By: HealthCor Group, LLC, its general partner

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel

 HEALTHCOR ASSOCIATES, LLC

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel


CUSIP No. 587188103 13G/A Page 20 of 20 Pages


 HEALTHCOR GROUP, LLC

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel

 JOSEPH HEALEY, Individually

 /s/ Joseph Healey
 -----------------------------------

 ARTHUR COHEN, Individually

 /s/ Arthur Cohen
 -----------------------------------


EXHIBIT 1

JOINT ACQUISITION STATEMENT PURSUANT TO RULE 13d-1(k)

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G/A is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G/A shall be filed on behalf of each of the undersigned without the necessity of filing additional joint acquisition statements. The undersigned acknowledge that each shall be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Dated: February 17, 2009


 HEALTHCOR MANAGEMENT, L.P., for itself and
 as manager on behalf of (i) HEALTHCOR OFFSHORE, LTD.
 and (ii) HEALTHCOR HYBRID OFFSHORE, LTD.

 By: HealthCor Associates, LLC, its general partner

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel

 HEALTHCOR CAPITAL, L.P., for itself and as general partner on behalf
 of HEALTHCOR L.P.

 By: HealthCor Group, LLC, its general partner

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel

 HEALTHCOR OFFSHORE GP, LLC, for itself and as general partner of
 behalf of HEALTHCOR OFFSHORE MASTER FUND, L.P.


 By: HealthCor Group, LLC, its general partner

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel

 HEALTHCOR HYBRID OFFSHORE GP, LLC, for itself and as general partner
 of behalf of HEALTHCOR HYBRID OFFSHORE MASTER FUND, L.P.


 By: HealthCor Group, LLC, its general partner

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel

 HEALTHCOR ASSOCIATES, LLC

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel

 HEALTHCOR GROUP, LLC

 By: /s/ John H. Coghlin
 -------------------------------------
 Name: John H. Coghlin
 Title: General Counsel

 JOSEPH HEALEY, Individually

 /s/ Joseph Healey
 -----------------------------------

 ARTHUR COHEN, Individually

 /s/ Arthur Cohen
 -----------------------------------

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