Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Eye prosthesis – Intraocular lens
Patent
1990-05-21
1991-02-19
Cannon, Alan W.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Eye prosthesis
Intraocular lens
A61F 216
Patent
active
049940830
ABSTRACT:
The invention pertains to a soft intracameral lens determined for the location in the posterior chamber of eye.
The soft intracameral hydrogel lens has its front supporting and centering convex part determined for leaning against iris having in front a rotation symmetrical shape of a sphere, paraboloid or hyperboloid and passing into the broadest circumference by a surface which shape is equal to or approaches a shape of lateral area of cone, while the hinder supporting part of the lens with a spherical, planar, or moderately convex or concave-curved shape for leaning against a hinder capsula or a membrane from vitreous body in a large surface area. The hinder supporting part is broadened and forms on the edge a retaining ring reaching over the front part as much as by 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% of 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 from soft hydrogel. The lens may also contain inside in its optical axis an inner part, e.g. a Fresnel lens, with a higher refractive index of light than has the surrounding part of the lens.
REFERENCES:
patent: 3866249 (1975-02-01), Flom
patent: 4664666 (1987-05-01), Barrett
patent: 4713244 (1987-12-01), Bawa et al.
Krcova Zuzana
Pitrova Sarka
Smetana Karel
Sulc Jiri
Cannon Alan W.
Ceskoslovenska akademie ved
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