Hydrophilic bifocal contact lens

Claim 1

A hydrophilic bifocal corneal contact lens comprising a concave rear surface and a convex front surface, said lens in frontal projection comprising: (a) a perimeter in the form of a truncated circle having a diameter of 14.5 mm, said truncation forming the bottom of said lens and having a height of about 1.5 mm, (b) a reading segment above the truncation having an upper boundary below the center of said truncated circle, the distance from said center to said upper boundary along a line bisecting the lens being from 1.5 to 3.5 mm, and (c) a distant-vision segment located such that the center of said truncated circle is within said distant-vision segment; wherein the prescriptions and maximum thickness at the center of such truncated circle are as follows: ______________________________________ Distant-Vision Add to Distant Vision Maximum Prescription, Prescriptions to Achieve Thickness t Diopters Reading Prescription, Diopters At Center, mm ______________________________________ -4 1.25 0.08 -2 1.25 0.08 0 1.25 0.08 +2 1.25 0.14 -4 2.50 0.08 -2 2.50 0.08 0 2.50 0.10 +2 2.50 0.15 +6 2.50 0.24 ______________________________________ whereby when said lens is worn by a patient the distant-vision segment covers at least 70 percent of the patient's pupil when the patient looks straight ahead.