Prosthetic lenses and methods of making the same

A method of manufacturing a lens for disposition on an eye, comprising:

• calculating characteristics of a back surface of the lens to provide a predefined clearance distance for the back surface of the lens above the eye;
• identifying at least one non-symmetrical feature on the eye resulting in a clearance distance for the back surface of the lens above the at least one non-symmetrical feature on the eye being less than the predefined clearance distance for the back surface of the lens above the eye;
• modifying the calculated characteristics of back surface of the lens according to the at least one non-symmetrical feature to provide the clearance distance for the back surface of the lens above the at least one non-symmetrical feature on the eye as at least the predefined clearance distance for the back surface of the lens above the eye, wherein the lens is configured to be rotationally stable in use based on the at least one non-symmetrical feature on the back surface of the lens;
• and
• generating a lens design file for controlling a manufacturing device to manufacture the lens according to the modified calculated characteristics of the back surface of the lens.

An optical device comprising:

• a lens configured to be disposed on an eye,
• wherein the lens is configured to contact a sclera of the eye and have a clearance above a cornea of the eye when disposed on the eye,
• wherein the lens comprises a back surface,
• wherein the back surface comprises at least one non-symmetrical feature that is configured to engage a corresponding feature on the eye, and
• wherein the lens is not aligned with a corneal apical axis of the eye and is configured to be rotationally stable in use based on the at least one non-symmetrical feature on the back surface of the lens.