Pupil regulated multifocal contact lenses
The invention provides a multifocal ophthalmic lens that both corrects for the wearer's refractive prescription and takes into account pupil size of a specific individual or of a population of individuals. The invention provides a lens having an optic zone having a substantially circular central zone containing over-refracted near vision power and a diameter of about 2.5 mm or less.
1. A hybrid contact lens, having a (a.) front surface comprising a first optic zone having a substantially rotationally symmetric central zone at the center thereof, the central zone having a diameter and comprising progressive addition power wherein the power continuously and progressively changes from near through intermediate to distance vision power from the center of the central zone to its periphery and, wherein a diameter of the central zone is determined by a lens wearer's pupil diameter measured at at least a first and a second luminance and (b.) a back surface comprising a second optic zone that is substantially circular and rigid.
2. The lens of claim 1 , wherein the diameter of the central zone is about 2.5 mm or less.
3. The lens of claim 1 , wherein the front surface further comprises cylinder power.
4. The lens of claim 1 , wherein the back surface comprises cylinder power.
5. The lens of claim 2 , wherein the back surface further comprises cylinder power.
6. The lens of claim 2 , wherein the front surface comprises cylinder power.
7. The lens of claim 1 , wherein the optic zone on the front surface of the lens further comprises at least one distance vision power zone that is an annular zone that surrounds the central zone.