EXHIBIT 99.20 Friday, February 27, 1998 Company Press Release Premier Laser Systems Tender Offer For Ophthalmic Imaging Systems Stock to Commence Following Effectiveness of Registration Statement IRVINE, CA (February 27, 1998) . . . . . . . Premier Laser Systems, Inc. (Nasdaq NM: PLSIA) announced today that it has agreed with Sacramento-based Ophthalmic Imaging Systems (Nasdaq:OISI) that Premier's tender offer for OIS' stock will commence promptly following the effectiveness of Premier's related registration statement. Premier intends to file the registration next week in order to register common stock, and common stock underlying warrants, to be offered to OIS' shareholders. As previously announced, Premier intends to offer, in return for each share of OIS tendered, $1.75 in cash, $0.25 in Premier stock and two warrants, each of which permit the holder to acquire $0.25 worth of stock for a nominal purchase price if OIS meets certain future revenue goals. OIS is engaged in the business of designing, developing, manufacturing and marketing digital imaging systems and image enhancement and analysis software for use by practitioners in the ocular health field. Premier Laser Systems develops, manufactures and markets several lines of proprietary medical lasers, fiber optic delivery systems, corneal topography systems and associated products and services for a variety of dental, ophthalmic and surgical applications.