| 摘要 |
PURPOSE: A differential thickness contact lens is provided which is compensated for differential shrinkage, as well as a method of manufacturing such lens. CONSTITUTION: A method of producing a contact lens which is compensated for differential shrinkage, comprises the following steps: designing a lens to have a first area of a first thickness and a second area of a second thickness, the first and second thicknesses being different; determining any differential shrinkage which will occur during the curing of the lens; modifying the lens to include geometrical features to compensate for the differential shrinkage, thereby creating a compensated contact lens. And also a method of producing a contact lens which is compensated for differential shrinkage, comprises the following steps: designing a lens to have a first area of a first thickness and a second area of a second thickness, the first and second thicknesses being different; determining a power and angular position of induced toricity which is caused by differential shrinkage occurring during the curing of the lens; modifying the lens to include a substantially equal and opposite toricity to the induced toricity, thereby creating a compensated lens.
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