<PAGE>   1
                                                                   EXHIBIT 10.10

                         EMPLOYEE STOCK OPTION AGREEMENT


         This Stock Option Agreement (the "Agreement") is made and entered into
as of the 3rd day of June, 1998, between Opticon Medical Inc. (the "Company")
and John LaMarche ("Employee").

                                   WITNESSETH

         Whereas, the Company employs the Employee as a key member of the
Company's management; and

         Whereas, the Company desires to encourage the Employee to remain in the
employ of the Company and for the Employee to have a personal interest in the
continued success and progress of the Company; and

         Whereas, the Company desires to offer certain compensation to the
Employee for satisfactory performance of his duties, including the stock options
granted by this Agreement, in addition to other compensation that the Company
may give to the Employee pursuant to a separate employment agreement; and

         Whereas, the Company previously granted Employee the following stock
options as evidenced by a Stock Option Agreement dated as of July 26, 1996 (the
"1996 Agreement"): (i) 37,500 shares of the Company's common stock granted on
August 14, 1995 ; and (2) 75,000 shares of the Company's common stock granted on
July 26, 1996;

         Whereas, the Company desires to amend the stock option grant evidenced
in the 1996 Agreement and the Employee has agreed to such amendment; and

         Whereas, the Company desires to grant additional stock options to
Employee and to document the terms and conditions of such stock option grant;

         Now therefore, in consideration of the foregoing and the covenants
contained herein, the Company and Employee agree as follows:

1.       AMENDMENT OF 1996 AGREEMENT.

         The Company and the Employee hereby agree that the 1996 Agreement and
the Employee's stock options thereunder are amended as follows:

         a. The option to purchase 82,500 shares of the Company's common stock
are not effected by this Agreement and shall remain in full force and effect in
accordance with the terms' and conditions of the 1996 Agreement, with the
vesting and exercisability thereof as described in Sections 2(a)(i), (iv), (v)
and (vi) of the 1996 Agreement.


<PAGE>   2

         b. The option to purchase 30,000 shares of the Company's common stock,
with the vesting and exercisability thereof as described in Section 2(a)(ii) and
(iii) are hereby deemed canceled and replaced in full by the additional stock
options granted under this Agreement.

2.       GRANT OF ADDITIONAL OPTION.

         Subject to the terms and conditions set forth in this Agreement, the
Company hereby grants to the Employee the right to purchase up to fifty thousand
(50,000) shares of the Company's common stock (the "Stock") at a price of $1.50
per share, subject to the adjustments as provided in Section 4 hereof (the
"Additional Option"). It is understood and agreed that the option price is the
per share fair market value of such shares on the date of each of the option
grants covered by this Agreement. The Company intends that the Additional Option
shall be an Incentive Stock Option governed by the provisions of Section 422 of
the Internal Revenue Code of 1986, as amended (the "Code"). The terms of the
Company's Incentive Stock Option Plan and the Additional Option shall be
interpreted and administered so as to satisfy the requirements of the Code.

3.       EXERCISE OF PURCHASE RIGHTS.

         (a) Vesting and Exercisability. The Additional Option shall not be
exercisable the first time by Employee except in accordance with subsection
422(d) of the Code. The Additional Option is hereby deemed fully vested as of
the date hereof.

         (b) Method of Exercise. Any portion of the Additional Option may be
exercised, in whole or in part, by delivery by Employee to the Company of
written notice of such exercise, accompanied by full payment of (i) the purchase
price with respect to that portion of the Additional Option being exercise and
(ii) any amounts required to be withheld pursuant to applicable income tax laws
in connection with such exercise. Until the Company notifies Employee to the
contrary, the form attached to this Agreement as Exhibit A shall be used to
exercise the Additional Option. Upon the exercise of the Additional Option, the
Company shall deliver to the Employee a certificate or certificates representing
the number of shares of Stock being purchased by Employee, free and clear of
encumbrances.

         The aggregate purchase price for the shares of Stock to be issued upon
exercise of the Additional Option shall be paid (i) in cash, (ii) by certified
check, (iii) by delivery of duly endorsed certificated representing shares of
Stock having a fair market value on the date of exercise aggregating at least
the portion of the purchase price being paid by delivery of such shares, (iv) in
a combination of cash and Stock, or (v) by such other lawful consideration as
the administrator of the Plan may approve. To the extent necessary to avoid
adverse financial accounting consequences to the Company associated with the use
of Stock to pay the purchase price upon exercise of the Additional Option and
except as the Board of Directors of the Company (the "Board") may otherwise
consent, no shares of Stock acquired under this Agreement or pursuant to any
employee benefit plan or program of the Company may be used to pay any portion
of the purchase price upon exercise of the Additional Option unless those shares
shall have been held for a period of not less than six months prior to the date
of exercise. For



                                       2
<PAGE>   3

purposes of this Agreement, the fair market value of a share of Stock shall be
determined by the Board pursuant to a reasonable method adopted in good faith
for such purpose.

         (c) Restriction Upon Shares of Stock Issued Upon Exercise. At the time
of the issuance of any shares of Stock upon exercise of the Additional Option,
Employee will, upon the request of the Company, agree in writing that he is
acquiring such shares for investment only and not with a view to resale, and
that he will not sell, pledge or otherwise dispose of such shares so issued
unless and until (i) the Company is furnished with an opinion of counsel to the
effect that registration of such shares pursuant to the Securities Act of 1933,
as amended (the "Securities Act"), is not required by the Securities Act and the
rules and regulations thereunder and any applicable state securities laws; or
(ii) such registration or notification as is, in the opinion of counsel for the
Company, required for the lawful disposition of such shares has been filed by
the Company and has become effective; provided however, that the Company is not
obligated to file any such registration or notification. Employee further agrees
that the Company may place a legend embodying such restriction on the
certificate(s) evidencing such shares.

         (d) Expiration of Option. To the extent that the Additional Option has
not been exercised, this Agreement shall terminate and be of no further force
and effect, and the Additional Option shall expire, on the earlier of (i) three
months after termination of Employee's employment with the Company for any
reason except the death or disability of the Employee or the Employee's
employment is terminated for cause, (ii) thirty-six (36) months after
termination of Employee's employment because of the Employee's death or
disability, (iii) at the time the Employee's employment is terminated for cause,
or (iii) the tenth anniversary of the date of the grant of the Additional
Option.

4.       ADJUSTMENT UPON CHANGES IN CAPITALIZATION.

         The type and number of shares of Stock subject to the Additional Option
and the purchase price per share shall be adjusted as the Board reasonably deems
appropriate to preserve the value of the Additional Option in the event of a
stock dividend, stock split or reverse stock split, recapitalization, merger,
consolidation, reorganization, cash or property dividend (including without
limitation a dividend payable in shares of stock of any subsidiary of Company),
exchange of shares, repurchase of shares or any other change in corporate
structure of or by Company that in any such event materially affects the
outstanding shares of Stock.

5.       NO RIGHTS AS STOCKHOLDER.

         Employee shall have no rights as a stockholder with respect to any
shares of Stock subject to the Additional Option until and unless a certificate
or certificates representing such shares are issued to Employee pursuant to
Section 3(b) of this Agreement. Except as provided in Section 4, no adjustment
shall be made for dividends or other rights for which the record date is prior
to the issuance of such certificate or certificates.



                                       3
<PAGE>   4

6.       EMPLOYMENT.

         Neither the granting of the Additional Option evidenced by this
Agreement nor any term or provision of this Agreement shall constitute or be
evidence of any understanding, express or implied, on the part of Company to
employ Employee for any period of time.

7.       NONTRANSFERABILITY.

         Employee's rights under this Agreement are not transferable by Employee
other than by will or in accordance with the laws of descent and distribution,
and are exercisable, during Employee's lifetime, only by Employee or, during his
disability, by his legal representative, and, after Employee's death, by his
estate, heirs or devisees and their successors and assigns.

8.       MISCELLANEOUS.

         (a) Headings. The headings in this Agreement are inserted for
convenience only and shall have no significance in the interpretation of this
Agreement.

         (b) Entire Agreement. This Agreement contains the entire agreement
between the parties with respect to the transactions contemplated under this
Agreement other than an employment agreement that may have been executed between
the Company and the Employee. This Agreement supersedes all prior arrangements
or understandings with respect to those transactions, written or oral. No
agreements or representations, oral or otherwise, expressed or implied, with
respect to the subject matter of this Agreement have been made by either party
which are not set forth expressly in this Agreement.

         (c) Successors. The terms and conditions of this Agreement shall be
binding and inure to the benefits of the parties to this Agreement and their
respective heirs, personal representative and successors.

         (d) Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Iowa applicable to agreements made and
entirely to be performed within such jurisdiction except to the extent federal
law may be applicable.

         (e) Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed to be an original and all of which
together shall constitute one and the same instrument.

         (f) Disposal of Shares. If Employee shall dispose of any of the shares
of Stock acquired upon exercise of the Additional Option within two (2) years
from the date the Additional Option was granted or within one (1) year after the
date of exercise of the Additional Option, then, in order to provide the Company
with the opportunity to claim the benefit of any income tax deduction, Employee
shall promptly notify the Company of the dates of acquisition and disposition of
such shares, the number of shares so disposed of, and the consideration, if any,
received for such shares.



                                       4
<PAGE>   5

         IN WITNESS WHEREOF, each of the parties to this Agreement has executed
this Agreement as of the day and year first written above.

                                         OPTICON MEDICAL INC. ("Company")



                                         By  /s/ Walter Sembrowich
                                             ----------------------------------
                                             Walter Sembrowich
                                             Chairman of the Board


                                         /s/ John LaMarche
                                         --------------------------------------
                                         John LaMarche ("Employee")



                                       5
<PAGE>   6

                                    EXHIBIT A

                                 OPTION EXERCISE

                   (To be signed only upon exercise of option)


The undersigned, the holder of the foregoing stock option, hereby irrevocably
elects to exercise the purchase right represented by such option for, and to
purchase thereunder, _______ of the shares of Common Stock of Opticon Medical
Inc., to which such warrant relates and herewith makes payment of $__________
therefor in cash or by check and requests that the certificates for such shares
be issued in the name of, and be delivered to whose address is set forth below
the signature of the undersigned.

Dated:                                       _________________________________
                                             [Signature]



                                             _________________________________

                                             _________________________________
                                             [Address]



                                       6