| 摘要 |
A soft contact lens having the ability to make bifocal corrections can be made by the conjunctive use of lens elements comprising: an annular main body portion having a concave, eye-contacting, posterior surface and a non-continuous, convex, anterior surface having a near vision-aiding add zone, a transition zone, a far vision-aiding zone and a slab-off system and wherein: (a) the near vision-aiding add zone has a diameter of from about 1.5 mm to about 3.5, (b) the transition zone has a base length of from about 0.03 mm to about 0.20 and (c) a slope angle of from about 15 DEG to about 40 DEG . Such lenses also can be used to correct astigmatisms by providing their posterior surface with a toric optic zone. |
