Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1985-06-11
1989-10-17
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351160H, G02C 704
Patent
active
048742341
ABSTRACT:
A toric contact lens with the center of gravity displaced in the direction to its edge by the effect of an one-sided thickening of the lens, where, according to the invention, its optical zone has as far as to the diameter of 5 to 8 mm the center of gravity precisely in the lens axis and the thickening is performed at one place of its edge to displace the center of gravity of the whole lens outside its axis, which thickening has the form of a drop, which would be formed by running down a liquid wetting a front convex surface of the lens if the lens is placed in the vertical position, whereas the direction of displacement of the center of gravity includes the required angle with the direction of toricity of the optical zone.
The casting surface of mould for production of the toric contct lens according to the invention is provided with a marginal cavity corresponding to the required thickening.
Moulds charged with a metered amount of monomer mixture are used for casting of the lens according to the invention in common equipment either for spin casting or for static casting in closed moulds.
REFERENCES:
patent: 4508436 (1985-04-01), Sitterle
Ceskoslovenska akademie ved
Sugarman Scott J.
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