AGREEMENT The undersigned agree that the Amendment No. 8 to Schedule 13D with respect to Common Stock, $0.01 par value, of OIS Optical Imaging Systems, Inc. to which this Agreement is attached as an Exhibit is, and that future amendments to such...

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                                                                      EXHIBIT 18



                                   AGREEMENT

The undersigned agree that the Amendment No. 8 to Schedule 13D with respect to
Common Stock, $0.01 par value, of OIS Optical Imaging Systems, Inc. to which
this Agreement is attached as an Exhibit is, and that future amendments to such
Schedule 13D will be, filed on behalf of each of us.



             *                     
------------------------------
XXXXXXX XXXXXXXX, By Xxxxxx X. Xxxxxx,
Attorney-in-fact, pursuant to Power of
Attorney filed as Exhibit 12.


GUARDIAN INDUSTRIES CORP.



By:  / Xxxxxx X. Xxxxxx /              
   ---------------------------
   Name:   Xxxxxx X. Xxxxxx
   Title:  Vice President and General Counsel


GD INVESTMENTS CORP.



By:  / Xxxxxx X. Xxxxxx /              
   ---------------------------
   Name:   Xxxxxx X. Xxxxxx
   Title:  Vice President and Secretary


*   / Xxxxxx X. Xxxxxx /              
------------------------------
      Xxxxxx X. Xxxxxx, Attorney-in-fact


Dated:  October 31, 1996