Sample Lens Chucks
HirstLens NZ Ltd
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Inside the box are two metal chucks with crimpers. The lens chuck is composed of two parts – the steel chuck and the brass crimper. The crimper acts like a screw which tightens and loosens, allowing a contact lens to be held in place on the chuck. These sample lens chucks were for the manufacture of a unique soft contact lens design, the TOC (Toric Optic Cap) - a proprietary lens design of Hirstlens. A soft contact lens in hard state would be crimped at a specific radius. Once held in position the chuck would then be spun on the lathe, and the lens radius was cut and polished. It would then be removed from the lathe and the crimp released, forming a toroidal surface - the shape required for toric contact lenses. This type of lens was prescribed to patients who needed correction for astigmatism.
Name Hirstlens / Address Box 6142 AK / SAMPLE CHUCK AND CRIMPER Ink stamp and hand-written
1960s. Sample Lens Chucks, 2018.1.7. The Museum of Transport and Technology (MOTAT).
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