Post-operative multifocal cataract lenses with base-in prismatic nearvision segments

Claim 1

A MULTI-FOCAL LENS FOR USE IN EYEGLASSES FOR POST OPERATIVE CATARACT PATIENTS, COMPRISING A DISTANT-VISION DISC OF RELATIVELY HIGH POWER TO COMPENSATE FOR THE LOSS OF THE CRYSTALLINE LENS OF THE PATIENT''S EYE, SAID DISTANT-VISION DISC HAVING A SUBSTANTIALLY CONCAVE CAVITY IN ITS POSTERIOR SURFACE, A NEAR-VISION SEGMENT EMBEDDED IN SAID CAVITY AND HAVING A CONVEX ANTERIOR SURFACE OF MATING CURVATURE WITH RESPECT TO THE WALL OF SAID CAVITY AND IN INTIMATE CONTACT THEREWITH, SAID DISTANT-VISION DISC BEING ANTERIORLY CONVEX AND OF POSITIVE POWER AND SAID NEAR-VISION SEGMENT BEING OF A HIGHER INDEX OF REFRACTION THAN SAID DISTANT-VISION DISC, AND A CARRIER DISC HAVING ITS ANTERIOR SURFACE MATING WITH THE POSTERIOR SURFACE OF SAID DISTANTVISION DISC AND SAID SEGMENT AND UNITARILY SECURED THERETO; SAID NEAR-VISION SEGMENT ALSO BEING OF POSITIVE POWER, THE OPTICAL CENTER OF SAID NEAR-VISION SEGMENT BEING DECENTERED NASALWARD WITH RESPECT TO THE OPTICAL CENTER OF SAID DISTANT-VISION DISC A SUFFICIENT DISTANCE TO PRODUCE A BASE-IN PRISMATIC EFFECT FOR THE GREATER PORTION OF THE HORIZONTAL READING SCOPE THEREOF INCLUDING THE POINT IN THE SEGMENT THROUGH WHICH PASSES THE CENTRAL VISION READING LINE OF SIGHT, AND THE ANTERIOR INTERFACE CONVEX HORIZONTAL CURVE OF SAID NEAR VISION SEGMENT INTERSECTING THE ANTERIOR CONVEX HORIZONTAL CURVE OF THE DISTANT-VISION DISC TO FORM AN EXPOSED FEATHER EDGE AT THE NASALWARD SIDE OF THE SEGMENT.