Document:

WAIVER

                                 April 12, 2001

To each of the Purchasers listed below:

     Reference  is made to Advanced  Optics  Electronics,  Inc.,  Note  Purchase
Agreement,  dated as of September 15, 2000 (the  "Purchase  Agreement")  between
each Purchaser therein defined and Advanced Optics  Electronics,  Inc., a Nevada
corporation (the "Company").  All terms defined in the Purchase  Agreement shall
have the same meaning when used in this waiver unless otherwise defined herein.

     Pursuant to Section 10.1(d) of the Purchase  Agreement,  the Company agreed
to file a registration  statement on Form SB-2 under the Securities Act of 1933,
as amended (the "Registration Statement"),  to register not less than 52,390,805
shares of Common Stock underlying the Registrable Securities consisting of:

     (i)  2,298,851  shares of Common  Stock  issuable  upon  conversion  of the
$500,000 Initial Closing Date Notes;

     (ii)  6,896,552  shares of Common Stock  issuable  upon  conversion  of the
$1,500,000 Second Closing Date Notes;

     (iii)  36,781,609  shares of Common Stock  issuable upon  conversion of the
$8,000,000 Obligation Notes;

     (iv) Initial  Warrants to purchase  2,000,000 shares of Common Stock issued
with respect to the Initial  Offering (at the rate of one warrant share for such
dollar amount of Notes then purchased); and

     (v)  Obligation  Warrants for 4,413,793  shares of Common Stock issued with
respect  to the  Obligations  Notes (at the rate of 12% of the  shares of Common
Stock to be issued upon conversion of the Obligation Notes).

     Each  Purchaser  hereby  waives the  Company's  obligation  to comply  with
Section 10.1(d) of the Purchase Agreement insofar as it relates to the filing of
the Registration  Statement to register the Registrable  Securities,  other than
such  Registrable  Securities  (the "Initial  Securities")  consisting of Common
Stock issuable upon conversion of the $500,000 Initial Closing Date Notes issued
on and dated as of  September  15, 2000 and the 500,000  shares of Common  Stock
underlying  the Initial  Warrants.  (For the  avoidance  of doubt,  the "Initial
Securities"  do not  include  any other  Notes or any  Warrants  issuable at any
time.) In addition,  each  Purchaser and the Company agrees that such section is
hereby  amended to change the number of shares of Common  Stock  required  to be
registered  shall  relate  solely to the Initial  Securities.  Failure to file a
registration  statement with respect to, or to register,  Registrable Securities
other than the

<PAGE>

Initial  Securities  shall not  constitute  a  Non-Registration  Event under the
Purchase Agreement or under any Warrants, or an Event of Default under the Notes
or Purchase Agreement.  The Company shall continue to be required to reserve for
issuance the amount of Common Stock described in the Purchase  Agreement as such
reservation relates only to the Initial  Securities.  The Company and Purchasers
agree that the Company may not exercise any  Obligation  Notice rights under the
Purchase  Agreement with respect to the $8,000,000 of Obligation  Notes and that
Company is not  obligated to sell and  Purchasers  are not obligated to purchase
the $1,500,000 of Second Closing Date Notes.

     Pursuant  to Section  2.3 of the  Purchase  Agreement,  the Company and the
Purchasers agreed that subject to certain  conditions,  a Purchaser could assign
to another party either before or after exercise of a Purchase Obligation by the
Company,  the Purchase  Obligation to pay all or some of the purchase price with
respect to the Purchase  Obligation and receive the corresponding  rights of the
Purchaser under the Purchase Agreement. The Company and the Purchasers do hereby
amend  such  section  in  order  that it  permit  assignments  between  existing
Purchasers to the exclusion of any other parties.

     The  Purchasers do not waive any damages  (liquidated  or otherwise) or any
other rights available to them. Except as set forth in this waiver, the Purchase
Agreement  remains in full force and effect.  Please  acknowledge your agreement
with the foregoing by signing in the space provided below.

                                          Very truly yours,

                                          ADVANCED OPTICS ELECTRONICS, INC.

                                          By: /s/ LESLIE S. ROBINS
                                              --------------------------------
                                              Name:  Leslie S. Robins
                                              Title: Executive Vice President

                                          Agreed and Accepted

                             PURCHASERS:

                             KESHET FUND L.P.

                             By: /s/ JOHN CLARKE
                                --------------------------

                                       2
<PAGE>

                             KESHET L.P.

                             By:  /s/  JOHN CLARKE
                                --------------------------

                             NESHER LTD.

                             By:  /s/  JOHN CLARKE
                                --------------------------

                             TALBIYA B. INVESTMENTS LTD.

                             By:  /s/  JOHN CLARKE
                                --------------------------

                                       3Agreement Between
               BioModa Inc. and Advanced Optics Electronics, Inc.

Whereas BioModa Inc. (BMI) is in the early stages of developing products for the
early detection,  imaging, treatment, and management of lung cancer, and whereas
BMI needs operating capital: and

Whereas Advanced Optics  Electronics,  Inc. (ADOT), is a sophisticated  investor
that has read the previously  SEC-qualified  BioModa  Offering  Memorandum  (not
presently  active) as well as the October 1997 version of the BMI business plan;
and

Whereas ADOT is interested in investing in BMI;  therefore BMI and ADOT agree to
the following terms.

ADOT will  initially  purchase a Certificate of Deposit in the amount of $10,000
(the "CD") from Los Alamos National Bank, which ADOT agrees to permit BMI to use
as  collateral  for a $10,000 loan from Los Alamos  National  Bank to BMI, to be
used to pay a $10,000  annual  licensing fee to University of  California.  ADOT
agrees to transfer  ownership of this CD, in exchange  for 59,940  shares of BMI
common stock,  before such time as an additional round of financing is completed
that values the total company (stock price x shares outstanding after completion
of said  financing)  at $1.5 million or more.  In addition,  upon receipt of the
$10,000 loan from Los Alamos  National  Bank, BMI will issue to ADOT warrants to
purchase an additional 100,952 shares of common stock,  exercisable at $0.20 per
share.  These warrants  shall expire 90 days from the date of issue.  With stock
obtained  from the transfer of the CD and the  exercise of all issued  warrants,
ADOT will own 5% of the common stock outstanding in BMI, compared with the stock
issued and  outstanding  (including  stock  issuable under warrants and options)
prior to the first  round of  financing  is  completed  that  values BMI at $1.5
million or more. Should the number of shares  outstanding  (including the shares
to be issued for the CD transfer) increase after issuance of the warrants,  then
the number of shares  available  under  warrants  will be  adjusted so that upon
exercise of all warrants,  ADOT would own 5% of the  outstanding  shares of BMI,
including the shares to be issued in exchange for the CD transfer.

It is agreed  that ADOT will  assist BMI in  completing  a next round of funding
that will  place a value on BMI equal to or  greater  than $1.5  million.  It is
anticipate that this round of funding will be  accomplished  with the investment
of $300,000 in exchange for 631,578  shares,  at a price of not less than $0.475
per share.  In exchange for this  assistance,  BMI will issue to ADOT options to
purchase  248,950  shares at a price per share of $0.38 (80% of the  anticipated
per share offer  price of $0.475).  These  options  will be issued upon  written
notice from ADOT to BMI that  specific  investors  have agreed in  principle  to
investing $300,000 in BMI under the aforementioned terms. The options

/s/ JG
                                       1
<PAGE>

will be  exercisable  for one year  from date of issue.  Should  the  previously
specified  funding  occur under terms that result in a greater  number of shares
subject  to  options  by ADOT will be  increased  so that upon  exercise  of his
options,  ADOT would own 10% of the outstanding  shares of BMI, including shares
issued in  exchange  for the CD  transfer  and shares of BMI,  including  shares
issued in exchange for the CD transfer and shares covered by outstanding warrant
and option agreements. Should the previously described funding occur under terms
that result in a share price  different from the  anticipated  $0.475 per share,
then the price of the  options  will be  adjusted  correspondingly,  so that the
option price per share remains at 80% of the price to the new investors.

It is agreed that ADOT's stock,  option,  and warrant holdings will be preserved
against dilution to the same extent as those of the three principal shareholders
of BMI. In addition, ADOT will always have the right, but not the obligation, to
maintain his  percentage  ownership in BMI by  participating  in any  subsequent
rounds of financing at the established price per share for new investors.

Miscellaneous

     a.   Waivers. No waiver by any party hereto of any right or remedy shall be
          effective unless in writing and signed by the party waiving said right
          or remedy. A waiver of a right or remedy under this Agreement is not a
          waiver of the fight or remedy on any subsequent occasion.

     b.   Notices.  All  notices,  requests,   demands,   approvals,  and  other
          communications which are required or may be given under this Agreement
          shall be in writing and shall be delivered  or mailed,  by first class
          mail, postage prepaid, to the party at the address set out hereinabove
          or to such other address as such party shall have  specified by notice
          in writing to the other party. Any such notice shall be deemed to have
          been received on the date of actual receipt.

     c.   Sections and Other Headings.  The section and other headings contained
          in this Agreement are for reference purposes only and shall not affect
          the meaning or interpretations of this Agreement.

     d.   Governing  Law.  This  agreement,  and all  transactions  contemplated
          hereby,  shall be governed by,  construed  and enforced in  accordance
          with the laws of the State of New  Mexico.  The parties  herein  waive
          trial by jury and  agree to submit to the  personal  jurisdiction  and
          venue of a court of subject matter jurisdiction  located in Bernalillo
          County, State of New Mexico. In the event that litigation results from
          or arises out of this Agreement or the performance hereof, the parties
          agree to reimburse the prevailing party's reasonable  attorney's fees,
          court  costs,  and all other  expenses,  whether or not taxable by the
          court  as  costs,  in  addition  to any  other  relief  to  which  the
          prevailing party may be entitled.

/s/ JG

                                       2
<PAGE>

     e.   Dispute  Resolution.  In the event of dispute  regarding  the terms of
          this  Agreement,  the parties will attempt in good faith to settle the
          dispute by arbitration  under the Commercial  Arbitration Rules of the
          American  Arbitration  Association,  in accordance  with the terms and
          conditions of this Agreement.

Having read and understood this document which consists of two (3) pages, and in
agreement,   the  designated   parties  affix  their   signatures   below.   Fax
transmissions  of originally  signed copies of this  agreement are acceptable as
originals  until such  originally  signed copies are  delivered.  This agreement
supersedes any other previous written or oral, implied or explicit agreements.

Advanced Optics Electronics, Inc.

/s/ Leslie S. Robins                                      December 31, 1997
---------------------------                               --------------------
by: Leslie S. Robins, Executive Vice President            Date

BioModa Inc.

/s/ Jeff Garwin                                           December 30, 1997
----------------------------                              --------------------
by: Jeff Garwin, MD, PhD                                  Date
    CEO, BioModa Inc.

/s/ JG

                                       3

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