POWER OF ATTORNEY

	Know all by these presents that the undersigned hereby
	constitutes and appoints Thomas G. Hood, Michael E.
	Seifert and John Lipscomb, his true and lawful
	attorneys-in-fact to:

	(1)	execute for and on behalf of the undersigned
	Forms 3, 4 and 5 in accordance with Section 16(a) of
	the Securities Exchange Act of 1934 and the rules
	thereunder;

	(2)	do and perform any and all acts for and on
	behalf of the undersigned which may be necessary or
	desirable to complete the execution of any such Form
	3, 4 and 5 and timely filing of such forms with the
	United States Securities and Exchange Commission and
	any other authority; and

	(3)	take any other action of any type whatsoever
	in connection with the foregoing which, in the opinion
	of such attorneys-in-fact, may be of benefit to, in the
	best interest of, or legally required by, the undersigned,
	it being understood that the documents executed by such
	attorneys-in-fact on behalf of the undersigned pursuant
	to this Power of Attorney shall be in such form and shall
	contain such terms and conditions as such attorneys-in-fact
	may approve in their discretion.

	The undersigned hereby grants to each attorney-in-fact,
	individually, full power and authority to do and perform
	all and every act and thing whatsoever requisite, necessary
	and proper to be done in the exercise of any of the rights
	and powers herein granted, as fully to all intents and
	purposes as each attorney-in-fact might or could do if
	personally present, with full power of substitution or
	revocation,hereby ratifying and confirming that each
	attorney-in-fact, or his substitute or substitutes,
	shall lawfully do or cause to be done by virtue of this
	power of attorney and the rights and powers herein granted.
	The undersigned acknowledges that the foregoing attorneys-
	in-fact, in serving in such capacity at the request of the
	undersigned, are not assuming any of the undersigned's
	responsibilities to comply with Section 16 of the Securities
	Exchange Act of 1934.

	IN WITNESS WHEREOF, the undersigned has caused this Power of
	Attorney to be executed as of this ___ day of _________, 2002.


	______________________________
	Signature:


	______________________________
	Print Name:
	??







Power of Attorney.DOC