EXHIBIT 10.4

                               FIRST AMENDMENT TO
                       BMC INDUSTRIES, INC. SAVINGS TRUST

BMC Industries, Inc. (the "Company") and Norwest Bank Minnesota, N.A. (the
"Trustee") hereby amend the BMC Industries, Inc. Savings Trust Agreement between
the Company and the Trustee as follows:

1.   Section 1.1 of the Trust Agreement is amended to read as follows:

     1.1  NAME OF TRUST. The name of the Trust evidenced by this Trust Agreement
          is the "BMC Industries, Inc. Savings and Profit Sharing Trust" (the
          "Trust").

2.   Section 3.1(f) of the Trust Agreement is amended to read as follows:

     (f)  The Trustee will vote or, in connection with a public or private
          tender or exchange offer, tender and sell or exchange shares of the
          Company's common stock held in the Trust in accordance with the
          direction of the Committee or another named fiduciary pursuant to
          Section 4.4.

3.   Section 4.1(a) of the Trust Agreement is amended to read as follows:

     (a)  The Committee, acting as the named fiduciary, will direct the Trustee
          to establish at least three separate investment accounts within the
          Fund, each separate account being hereinafter referred to as an
          "Investment Fund." One such Investment Fund will be invested in shares
          of the Company's common stock except for such amounts of cash as the
          Committee determines to be necessary to satisfy short-term liquidity
          requirements and cash held pending acquisition of shares of the
          Company's common stock. The remaining Investment Funds may be invested
          in (i) shares of investment companies registered under the Investment
          Company Act of 1940, (ii) collective funds maintained by a bank or
          trust company, (iii) an insurance contract or contracts or pool or
          pools of insurance contracts and (iv) funds managed by a registered
          investment manager, bank or insurance company. The Trustee has no
          authority with respect to the selection of the Investment Funds, or
          for the investment management of these accounts, except as provided in
          Section 4.2 respecting a Trustee managed investment account, if any.
          The Trustee will transfer to each such Investment Fund such portion of
          the assets of the Fund as directed by the Administrator or directly by
          a participant or beneficiary, in such form as the Trustee may
          reasonably require.

4.   Section 4.4 of the Trust Agreement is amended to read as follows:

     4.4  VOTING AND TENDER OF COMPANY STOCK; VOTING OF OTHER SECURITIES.

          (a)  Shares of the Company's common stock held in the Trust will be
               voted by the Committee in its discretion. In connection with any
               private or public tender or exchange offer for shares of the
               Company's common stock, the Committee will determine in its
               discretion whether to tender and sell or exchange shares of the
               Company's common stock held in the Trust. The Trustee has no
               discretion over the voting or tendering the Company's common
               stock held in the Trust, and its responsibility over such matters
               is limited to voting or tendering such stock as directed by the
               Committee. The Company may appoint another entity as a named
               fiduciary for the purpose of voting and/or tendering shares of
               the Company's common stock for any matter, and if so, the Company
               shall furnish the Trustee with written notice of such appointment
               and the appointee's acceptance.

          (b)  Except as provided in Section 4.4(a), the voting of proxies for
               any securities held by the Trust is the responsibility of the
               Committee, acting as named fiduciary, unless the Trustee or an
               investment manager has investment management authority over the
               securities, in which case voting is the responsibility of the
               Trustee or investment manager. With respect to securities over
               which the Trustee does not have investment management authority,
               the Trustee will make its best effort to timely delivery proxies
               to the party which it reasonably believes to have investment
               management authority over such securities. The Trustee may use
               agents to effect such delivery. The Trustee is not responsible
               for ascertaining whether, or how, the proxies were subsequently
               voted or disposed of. In the event investment management
               authority over any securities is 





               transferred from the Trustee to a named fiduciary or investment
               manager, such transfer of authority will include the transfer of
               the power and responsibility to vote proxies under the party's
               investment management authority unless the Trustee agrees in
               writing to retain investment management power and responsibility
               to vote proxies.

This Amendment is effective March 15, 1999.

The Company and the Trustee have caused this instrument to be executed this 8th
day of April, 1999.

                                               BMC INDUSTRIES, INC.

                                               By /s/ JEFFREY J. HATTARA
                                                 -------------------------------


                                               NORWEST BANK MINNESOTA, N.A.

                                               By /s/ PORTIA RAMOS
                                                 -------------------------------