STOCK EXCHANGE AGREEMENT

      THIS STOCK EXCHANGE AGREEMENT (this "Agreement") is entered into and is
effective for all purposes as of the 10th day of February, 1997, by and between
TLC The Laser Center, Inc., a corporation organized under the laws of Ontario
("TLC") and Mark Speaker, M.D. ("Speaker").

                                    RECITALS

      WHEREAS, Speaker is a shareholder of 20/20 Laser Centers, Inc., a Maryland
corporation ("20/20") as well as a holder of certain options to purchase stock
in 20/20 (the "Options"), pursuant to that certain Stock Option Agreement
between 20/20 and Speaker dated as of August 1, 1996 (the "Option Agreement").

      WHEREAS, 20/20 and TLC have entered into a Share for Share Exchange
Agreement dated as of December 15, 1996 (the "TLC Exchange Agreement") pursuant
to which TLC is offering to purchase all of the outstanding shares of 20/20 from
its existing shareholders.

      WHEREAS, Speaker received his Options in consideration of personal
services provided to 20/20 pursuant to that certain (a) letter of agreement
dated June 23, 1995 (the "City Organizer Agreement") describing Speaker's
responsibilities and compensation in connection with being an M.D. City
Organizer in the New York Metropolitan area, and (b) a letter of agreement dated
June 23, 1995 (the "Other Services Letter") which confirms Speaker's agreement
with 20/20 with respect to certain other services for 20/20, each of which has
been amended by that certain letter agreement dated as of August 1, 1996 (the
"Letter Amendment") with respect to the stock compensation to be paid under the
City Organizer Agreement and the Other Services Letter. In addition, Speaker is
a party to that certain Team Surgeon Agreement dated June 23, 1995 among
Speaker, 20/20, and 20/20 Laser Vision Correction Associates, P.C. (the "Team
Surgeon Agreement"). The City Organizer Agreement, the Other Services Letter,
the Letter Amendment, and the Team Surgeon Agreement shall be referred to herein
collectively as the "Services Agreements".

      WHEREAS, it is in the best interests of 20/20 and TLC that Speaker
continue to provide his personal services under the existing Services
Agreements.


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      WHEREAS, Speaker is willing to continue to provide services pursuant to
the terms and conditions of the existing Service Agreements so long as TLC
enters into this agreement concerning the exchange of shares at the time Speaker
exercises his outstanding options to purchase shares of 20/20, and TLC is
willing to do so on the terms and conditions set forth below.

      NOW THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties, intending to be
legally bound, agree to the following terms:

      1. Ratification of Services Agreements. The parties hereto ratify and
confirm the Services Agreements and acknowledge that they are in full force and
effect.

      2. Share Exchange. In the event Speaker exercises his options to purchase
20/20 stock pursuant to the Option Agreement on or before March 1, 1999, then
promptly after the exercise of such option, TLC agrees to issue TLC stock in
exchange for the 20/20 stock purchased by Speaker, at an exchange ratio of
 .37517 shares of TLC stock for each share of 20/20 stock and Speaker agrees to
accept such exchange of TLC stock, subject to the provisions of paragraphs 4 and
8 below. In the event any Options are not exercised on or before March 1, 1999,
then the obligations of TLC and Speaker under this paragraph 2 shall be null and
void with respect to such Options.

      3. Continuance of Services Agreements. Speaker agrees not to give notice
of termination of his Services Agreements with 20/20 prior to the earlier to
occur of (i) the closing of the TLC stock exchange pursuant to the TLC Exchange
Agreement, or (ii) the termination of the TLC Exchange Agreement.

      4. Adjustment of Option Shares and Change in Capital Structure.

            a. This Agreement shall not affect in any way the right or power of
      TLC or its stockholders to make or authorize any or all adjustments,
      recapitalizations, reorganizations or other changes in TLC's capital
      structure or its business, or any merger or consolidation of TLC, or any
      issuance of bonds, debentures, preferred or prior preference stock ahead
      of or affecting the common stock or the rights thereof, or the dissolution
      or liquidation of TLC, or any sale or transfer of all or any part of its
      assets or business, or any other corporate act or proceeding, whether of a
      similar character or otherwise.

            b. If TLC shall effect a subdivision or consolidation of shares or
      other capital readjustment, the payment of a stock dividend, or other
      increase or reduction of the number of shares of the common stock
      outstanding, without receiving compensation therefor in money, services or


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      property, then (1) the number, class, and per share price of shares of
      common stock to be exchanged hereunder shall be appropriately adjusted in
      such a manner as to entitle Speaker to receive upon exercise of an Option,
      for the same aggregate cash consideration, the same total number and class
      of shares as he would have received had Speaker exercised his Option in
      full immediately prior to the event requiring the adjustment; and (2) the
      number and class of shares then reserved for issuance hereunder as a
      result of Options outstanding shall be adjusted by substituting for the
      total number and class of shares of common stock then reserved that number
      and class of shares of common stock that would have been received by the
      owner of an equal number of outstanding shares of each class of common
      stock as the result of the event requiring the adjustment.

            c. After a merger of one or more corporations with TLC or after a
      consolidation of TLC and one or more corporations, Speaker shall, at no
      additional cost, be entitled upon exercise of an Option to receive
      pursuant to this Agreement in lieu of the number and class of shares as to
      which he would be entitled to exchange pursuant to paragraph 2 hereof, the
      number and class of shares of stock or other securities to which Speaker
      would have been entitled pursuant to the terms of the agreement of merger
      or consolidation if, immediately prior to such merger or consolidation,
      Speaker had been the holder of record of the number and class of shares of
      common stock equal to the number and class of shares as to which he would
      be entitled under paragraph 2 hereof.

            d. Except as previously expressly provided, neither the issuance by
      TLC of shares of stock of any class, or securities convertible into shares
      of stock of any class, for cash or property, or for labor or services
      either upon direct sale or upon the exercise of rights or warrants to
      subscribe therefor, or upon conversion of shares or obligations of TLC
      convertible into such shares or other securities, nor the increase or
      decrease of the number of authorized shares of stock, nor the addition or
      deletion of classes of stock, shall affect, and no adjustment by reason
      thereof shall be made with respect to, the number, class or price of
      shares of common stock then subject to this Agreement.

            e. Adjustment under the preceding provisions of this section will be
      made by the Board of Directors of TLC in good faith, whose determination
      as to what adjustments will be made and the extent thereof will be final,
      binding, and conclusive.

      5. Authorization and Reservation of Shares. During the term of this
Agreement, TLC will at all times have authorized and reserved a sufficient
number of shares of its common stock to provide for the rights to exchange as
provided for herein. TLC represents and warrants that (i) all stock issued to
Speaker in 


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exchange for 20/20 stock shall be validly issued, fully paid and non-assessable,
and (ii) such stock shall be free of restrictions on transferability imposed by
TLC other than the provisions of paragraph 8 hereof and the terms and conditions
of the Holdback Agreement (defined in paragraph 8), provided however, that,
subject to the provisions of paragraph 7 hereof and the terms and conditions of
the Registration Rights Agreement (defined in paragraph 7), such stock may be
subject to restrictions on transferability imposed by applicable law.

      6. No Fractional Share or Scrip. No fractional shares or scrip
representing fractional shares shall be issued hereunder. Any fractional shares
shall be rounded to the nearest whole share such that fractions of .50 and
greater shall be rounded up to the next whole share and fractions of less than
 .50 shall be rounded down.

      7. Registration Rights Agreement. TLC acknowledges and agrees that the TLC
shares issuable to Speaker pursuant to this Agreement (a) shall be included as
part of the shares that are subject to that certain Registration Rights
Agreement dated concurrently herewith between TLC and the shareholders of 20/20
(the "Registration Rights Agreement"), and (b) shall be included in any
obligation of TLC to register shares of former 20/20 shareholders on the Toronto
Stock Exchange pursuant to the TLC Exchange Agreement.

      8. Holdback Agreement. The parties acknowledge and agree that the TLC
shares to which Speaker may be entitled pursuant to this Agreement are subject
to the terms and conditions of that certain Holdback Agreement dated
concurrently herewith between TLC and the shareholders of 20/20 (the "Holdback
Agreement") and that any TLC shares issued to Speaker pursuant to this Agreement
shall be subject to the terms and conditions of the Holdback Agreement. In the
event TLC is entitled to indemnification under the Holdback Agreement prior to a
time that Speaker has exercised all of his Options, then the exchange ratio set
forth in paragraph 2 hereof shall be modified so that the number of TLC shares
that Speaker receives pursuant to this Agreement upon exercise of an Option
shall be adjusted so that upon the exercise of an Option, Speaker receives the
number and class of shares of stock or other securities to which Speaker would
have been entitled pursuant to the terms of the Holdback Agreement if,
immediately prior to the exercise of such Options, Speaker had been the holder
of record of the number and class of shares of common stock equal to the number
and class of shares as to which he would be entitled under paragraph 2 hereof.
Speaker acknowledges that he is an "Insider" for purposes of the Holdback
Agreement.

      9. Miscellaneous. This Agreement shall be governed by and construed under
the laws of the State of Maryland. The titles of the sections and subsections of
this Agreement are for convenience only and are not to be considered in
construing this Agreement. This Agreement does not entitle


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Speaker to any voting rights or other rights as a shareholder of TLC with
respect to any shares that are the subject matter hereof prior to the exercise
of the Options as provided for herein. All notices required or permitted to be
given under this Agreement shall be in writing and shall be delivered in person,
by telecopy, by express courier or by certified mail, return receipt requested,
postage prepaid.

            IN WITNESS WHEREOF, the parties have signed this Agreement as of the
date first set forth above.


                                          TLC:

                                          TLC The Laser Center, Inc.


                                          By: /s/ R.J. Kelly
                                              ----------------------------------
                                              Ronald Kelly, Vice President

                                          SPEAKER:


                                              /s/ Mark Speaker, M.D.
                                              ----------------------------------
                                                  Mark Speaker, M.D.

Acknowledged and Agreed To:

20/20 Laser Centers, Inc.


By: /s/ Elizabeth A. Karmin
    ---------------------------


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