Eyeglass lens for persons suffering from severe ametropia

Details Eyeglass lens for persons suffering from severe ametropia Eyeglass lens for persons suffering from severe ametropia

G - Physics

02

C

88/38

G02C 7/00 (2006.01) B24B 13/00 (2006.01) G02C 7/02 (2006.01)

Patent

CA 1223142

ABSTRACT OF THE DISCLOSURE: An ophthalmic lens for persons suffering from severe ametropia. The lens comprises a convex object-side front surface and an eye-side rear surface. The rear surface consists of a central region, a surrounding outer region; and a transition region between the central region and said outer region. The central region is developed as a surface chosen from the group consisting of aspherically developed surfaces of revolution and atorically developed surfaces, for optimal correction of aberrations. The central region has a diameter such that provides a wearer with an object-side viewing angle of at least 20 degrees. The transition region has a rear surface of such curvature that the entire rear surface of the lens including the central region and the outer region and the transition region, is continuously differentiable twice, in the sense that the second derivative of the curvature is a continuous function without steps, and the rear surface, in radial cross section forms a smooth curve without any abrupt change in curvature. Such a lens has an appearance which is fully satisfactory esthetically and makes it possible to keep the overall magnification of the system consisting of the eye and the eyeglass lens closer to 1 than in the case of previously known lenses. Aberrations are optimally corrected within a sufficiently large region, and no disturb- ing discontinuities in the fields of view occur.

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