Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Reexamination Certificate
1999-08-11
2001-10-23
Manuel, George (Department: 3737)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
C351S16000R
Reexamination Certificate
active
06305802
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to a system and method for improving the vision of the eye. More specifically, the present invention relates to a system and method of integrating corneal topographic data and ocular wavefront data with primary ametropia measurements to create a soft contact lens design.
BACKGROUND OF THE INVENTION
The surface topography of most human corneas is not spherical. Instead, the corneal surface typically changes at varying, unpredictable and unique rates from the center of the cornea out to the periphery in a manner which is unique to each individual cornea. The fit of contact lenses that rest on the cornea can take this corneal shape irregularity into account. Corneal topographic analysis using a corneal topographer is used to provide information about the shape on the cornea. Generally, a corneal videokeratoscope includes a camera, for example a charge coupled device or CCD camera, for sensing the images of rings or points or patterns of light reflected from the cornea. The camera transmits video signals to a computer, or other image processing device, which analyzes the camera signals and produces data used in determining the contour of the cornea of the human eye.
SUMMARY OF THE INVENTION
The present invention is for a system and method of integrating corneal topographic data and ocular wavefront data with primary ametropia measurements to create a soft contact lens design. According to the present invention, corneal topographic data is used to design a better fitting soft contact lens by achieving a contact lens back surface which is uniquely matched to a particular corneal topography, or which is an averaged shape based on the particular corneal topography. In the case of a uniquely matched contact lens back surface the unique back surface design also corrects for the primary and higher order optical aberrations of the cornea. Also, ocular wavefront analysis is used to determine the total optical aberration present in the eye. The total optical aberration, less any corneal optical aberration corrected by way of the contact lens back surface, is corrected by way of the contact lens front surface design. The contact lens front surface is also designed to take into account the conventional refractive prescription elements required for the particular eye. As a result, the lens produced in accordance with the present invention will exhibit an improved custom fit, and improved optimal refractive error correction and vision.
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Collins Michael J.
Davis Brett A.
Roffman Jeffrey H.
Ross, III Denwood F.
Gianneschi Lois
Johnson & Johnson Vision Products Inc.
Manuel George
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