Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Eye prosthesis – Intraocular lens
Patent
1989-07-12
1990-09-11
Cannon, Alan W.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Eye prosthesis
Intraocular lens
A61F 216
Patent
active
049559036
ABSTRACT:
The invention pertains to a soft intracameral lens intended for location in the posterior chamber of the eye.
The soft intracameral hydrogel lens has a front supporting and centering convex part intended for leaning against the iris having a rotational symmetrical shape of a sphere, paraboloid, or hyperboloid and passing into the broadest circumference by a surface, the shape of this surface being equal to or approaching the shape of the lateral area of a cone, while the hinder, or rear, supporting part of the lens has a spherical, planar, or moderately convex or concave-curved shape and a large surface area for leaning against a hinder capsula or a membrane of the vitreous body. The hinder supporting part is broadened and forms on its edge a retaining ring which reaches over the front part by as much as 1.5 mm, whereas the central thickness of the lens ranges between 1 to 3.5 mm. The surface of the soft intracameral lens may be formed, at least in part, from a soft hydrogel containing at least 70% water at 20.degree.C. in the state of equilibrium swelling. The lens may have a spherical shape and be provided on the circumference with a supporting collar manufactured from a soft hydrogel. The lens may also contain inside, in its optical axis, an inner part, e.g., a Fresnel lens, having a higher refractive index of light than the material which surrounds the inner part of the lens.
REFERENCES:
patent: 4424597 (1984-01-01), Schlegel
patent: 4846832 (1989-07-01), Wichterle
Krcova Zuzana
Pitrova Sarka
Smetana Karel
Sulc Jiri
Cannon Alan W.
Ceskoslovenska akademie ved
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