Non-progressive corridor bi-focal lens with substantially tangent boundary of near and distant visual fields

摘要

An axially symmetric, bifocal, non-progressive ophthalmic lens which, in a smooth pathway between a distant vision field and a near vision field, has no perceptible progression of power, dividing line, image jump, nor other optical distortion.

主权项

1. A bifocal, non-progressive ophthalmic lens, comprising:
a rotationally symmetric convex surface; a concave surface opposite the convex surface, said concave surface including:
a first visual field having a first optical power for distance vision, anda second visual field having a second optical power for near vision,the first and second visual fields contacting each other in a substantially tangent manner, without a segment and without a progressive corridor, and smoothly blending with the remainder of the concave surface without image jump among the first and second visual fields and the concave surface, wherein respective radii of the first and second visual fields lie on a centerline of a contact surface also included in the concave surface of the lens between the first and second visual fields.