Contact lenses with off-axis bevel

Details Contact lenses with off-axis bevel Contact lenses with off-axis bevel

1998-10-26

2001-08-07

Mai, Huy (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S174000

Reexamination Certificate

active

06270218

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to contact lenses. In particular, the invention relates to contact lenses that have an off-axis bevel.
BACKGROUND OF THE INVENTION
The use of contact lenses for cosmetics and the correction of visual acuity is well known. Generally, contact lenses incorporate a convex surface bevel at the lens' periphery that acts to decrease the lens' edge thickness. Typically, these bevels are rotationally symmetric sections of a sphere. The center of curvature of which is located on the central axis of the lens.
These on-axis bevels form a junction with the non-optical lenticular zone of the lens. This junction is problematic in that it may act as a hinge point for the bevel allowing the bevel to turn in toward, or outwardly from, the wearer's eye. Further, the junction may be sufficiently sharp so as to make the lens uncomfortable to wear. Therefore, a need exists for a bevel that overcomes the disadvantages of the prior art bevel.


REFERENCES:
patent: 4095878 (1978-06-01), Fanti
patent: 4297008 (1981-10-01), Woodford
patent: 4948245 (1990-08-01), Seger et al.
patent: 4971433 (1990-11-01), Neefe
patent: 2192291 (1988-01-01), None
patent: WO 86/02462 (1986-04-01), None
patent: WO 90/09610 (1990-08-01), None

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