EXHIBIT 11.1 SUMMIT MEDICAL SYSTEMS, INC. Computation of Earnings Per Share (Unaudited) Three Months Ended Six Months Ended June 30, June 30, 1997 1996 1997 1996 - ----------------------------------------------------------------------------------------------------------- PRIMARY EARNINGS PER SHARE: Weighted average shares outstanding 10,359,065 9,153,849 10,353,351 8,512,379 Net effect of dilutive stock options--based on the treasury stock method - - - - --------------------------- --------------------------- 10,359,065 9,153,849 10,353,351 8,512,379 --------------------------- --------------------------- Net loss $(6,309,068) $ (222,210) $(10,807,115) $ (473,614) --------------------------- --------------------------- Net loss per share $ (0.61) $ (0.02) $ (1.04) $ (0.06) --------------------------- --------------------------- FULLY DILUTED EARNINGS PER SHARE: Weighted average shares outstanding 10,359,065 9,153,849 10,353,351 8,512,379 Net effect of dilutive stock options--based on the treasury stock method - - - - --------------------------- --------------------------- 10,359,065 9,153,849 10,353,351 8,512,379 --------------------------- --------------------------- Net loss $(6,309,068) $ (222,210) $(10,807,115) $ (473,614) --------------------------- --------------------------- Net loss per share $ (0.61) $ (0.02) $ (1.04) $ (0.06) --------------------------- ---------------------------