Abstract: A corneal-scleral orthokeratology contact lens is formed of rigid gas permeable material with uniform arc lengths in the treatment area even when the corneal curvature varies and asymmetric blends or splines called minor zones, where the portion of the blend or spline is shorter toward the lens center and broader toward the lens edge, and relieve the treatment area of all centering responsibility, transferring it to the limbal-scleral region. The method of determining the total sagittal height of an eye at a given chord diameter to predetermine exact fitting parameters and predict unaided visual outcome trial lenses, with exact chord and sagittal height values used to match the sagittal height of an eye, the sagittal value may be obtained from some ocular topographers. A computer program can easily take the sagittal information and design an optimum lens.

Abstract: A corneal-scleral orthokeratology contact lens is formed of rigid gas permeable material with uniform arc lengths in the treatment area even when the corneal curvature varies and asymmetric blends or splines called minor zones, where the portion of the blend or spline is shorter toward the lens center and broader toward the lens edge, and relieve the treatment area of all centering responsibility, transferring it to the limbal-scleral region. The method of determining the total sagittal height of an eye at a given chord diameter to predetermine exact fitting parameters and predict unaided visual outcome trial lenses, with exact chord and sagittal height values used to match the sagittal height of an eye, the sagittal value may be obtained from some ocular topographers. A computer program can easily take the sagittal information and design an optimum lens.

Abstract: A corneal-scleral orthokeratology contact lens is formed of rigid gas permeable material with uniform arc lengths in the treatment area even when the corneal curvature varies and asymmetric blends or splines called minor zones, where the portion of the blend or spline is shorter toward the lens center and broader toward the lens edge, and relieve the treatment area of all centering responsibility, transferring it to the limbal-scleral region. The method of determining the total sagittal height of an eye at a given chord diameter to predetermine exact fitting parameters and predict unaided visual outcome trial lenses, with exact chord and sagittal height values used to match the sagittal height of an eye, the sagittal value may be obtained from some ocular topographers. A computer program can easily take the sagittal information and design an optimum lens.

Abstract: A contact lens is formed of rigid gas permeable material and covers the cornea and a small adjacent portion of the sclera of an eye. The posterior surface of the lens has a radially outer portion that generally conforms with the shape of the ocular surface in the scleral region. The posterior surface of the lens covering the corneal region of the eye is selectively spaced from, aligned with, or in eyelid bearing pressure contact with, the corneal region of the eye, whereby the eyelid bearing pressure is controllably distributed over both the scleral and corneal regions of the eye. The contact lens is comfortable to wear, not prone to unintended dislodgement during periods of physical activity, and can be worn after surgical treatment of the cornea and is thinner and much smaller than previous scleral contact lenses.

Abstract: A method and apparatus for a multi-element lens system which combines pre-selected radial differences of separate ophthalmic lenses with non-mating curvatures into a single, flexibly conforming laminated unit. The system comprises a primary lens element of structural rigidity and at least one additive lens having an initially non-mating curvature formed of a thin, pliable plastic for providing a complemental ophthalmic correction or addition when flexibly conformed and bonded thereto. The assembled lens is therein capable of providing virtually any optical correction or addition by the determination and application of the appropriate additive lens having the requisite radial difference. In this manner, the ophthalmic inventory of practitioners can be reduced by providing a series of additive lenses in graduated radial differences which may be bonded to any of a stock of ophthalmic lens configuration with different initial curvatures.