Contact lens with pre-determined useful life

Details Contact lens with pre-determined useful life Contact lens with pre-determined useful life

1990-07-17

1992-10-27

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351177, G02C 704

Patent

active

051593602

ABSTRACT:
The present invention contact lens is a soft, disposable lens which, under eye wearer conditions, changes one or more characteristics essential for comfortable use, at a predetermined time to initiate disposal thereof by the user. This lens, under wear conditions, changes, for example, at least its base curve redius and its deformability as a consequence of a change in hydrophilicity of at least a portion of the contact lens material. This hydrophilicity change may be achieved by various means, e.g. degradation of crosslinking bridges or conversion of less hydrophilic groups to groups having greater hydrophilicity. In one preferred embodiment, the conversion is achieved by hydrolysis of selected functional (hydrophobic) groups into hydrophilic groups.

REFERENCES:
patent: 3220960 (1965-11-01), Wichterle et al.
patent: 4163609 (1979-08-01), Neefe

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