Preferential orientation of contact lenses
AssigneeBausch & Lomb Incorporated
InventorsDavid J. Fischer, Idella B. Wooten, John C. Thomas, James A. Reid
Life of this patent
Estimating the term…
Abstract
An improved contact lens and method of forming the same which causes the lens to adopt and maintain a particular angular orientation upon the eye of a wearer. One or more characters are formed in relief upon a surface of the lens at a point which is intended as the topmost point in the lens when properly oriented. The relieved characters may be used alone or in combination with previously-known means for effecting orientation of the lens.
Claims20
A soft contact lens having an optical power which varies radially and circumferentially about the optic axis of the lens comprising at least one character formed in relief upon a surface of the lens, said character being disposed in the peripheral portion of the lens adjacent the periphery without intersecting the periphery and symmetric about the 90th meridian thereof for causing said lens to maintain a predetermined orientation upon the eye of a wearer, said character being substantially smaller than the effective optical zone of the lens.
A contact lens adapted to be disposed upon the surface of the eye, said lens having a predetermined asymmetric surface defined as a combination of sphere and cylinder, said cylinder to have a predetermined orientation upon the eye, including means for maintaining the orientation of said lens upon the eye comprising at least one character formed in relief and disposed upon the surface of said lens and in the peripheral portion of the lens and adjacent the periphery without intersecting the periphery, said character being small in size as compared to the effective optical area of said lens.
A method of fabricating a soft contact lens which will maintain the axis of cylindrical correction in the lens in a predetermined orientation upon the eye of the wearer with respect to the 90th meridian of the eye comprising the steps of forming at least one relief character disposed in the peripheral portion of the lens adjacent the periphery without intersecting the periphery and at a point corresponding to the 90th meridian of the eye.
Dependencies are inferred from the claim text.