ORTHOKERATOLOGICAL LENS-EYE SYSTEM FOR STROMAL REMODELING

摘要

Embodiments of this application are directed toward an orthokeratological contact lens to be worn on a patient's cornea and methods for prescribing the same. The method may comprise receiving patient corrective parameters and generating a target treatment curve for a target zone, wherein generating the target treatment curve comprises calculating a difference of a first arc length determined when a load is applied to the cornea and a second arc length when no load is applied to the cornea. The contact lens comprises a parabolic lens having an inner surface configured to face an epithelium of the patient's cornea, wherein the parabolic lens is adapted to reshape the cornea by way of stromal remodeling via collagen fibril lengthening or shortening from the strain induced by the stress imposed by the unique lens design. The change in fibril length without a change in its chord diameter changes its radius of curvature and hence changes the radius on the corneal surface. There is no stromal hypertrophy just a radius and resultant sagittal height change. Collagen is a linear elastic solid material and its measurement (Young's Modulus) can be expressed precisely and mathematically. In pre-treatment configuration, an outer surface of the epithelium does not conform to the contours of the inner surface of the parabolic lens such that there exists a gap comprising a volume and ‘phantom’ lens shape that is disposed between the epithelium and the parabolic lens. This gap becomes obliterated with the induced sagittal height change and thereby eliminates the undesired refractive error.