SANTA CLARA, Calif., April 16 -- VISX Inc. has reported 1999 first quarter revenues of $53,949,000 compared to $24,310,000 for first quarter 1998. Net income for the first quarter of 1999 was $19,731,000, or $0.58 per share, compared to net income of $8,962,000, or $0.29 per share, for the comparable period of the prior year.The Company, a developer of refractive laser technology, also announced that its board of directors has approved a two-for-one stock split payable in the form of a 100 percent stock dividend to shareholders of record on April 27, 1999. Upon completion of the stock split, the number of shares outstanding will be approximately 63 million.