The system allowed for the correction of astigmatism and anisometropia with cylindrical powers up to 4D and spherical powers to ±12.00D. The 40mm round eye frames allow for easy accurate axis orientation and were made with three different bridge sizes providing three pupil distance options of 60, 64 and 68mm.
The frames have a small locking pin in the rim at the nasal point that prevents the lenses from rotating and helps to locate them in the frames with the correct axis direction. Twelve hundred 40mm diameter pre-cut and bevelled hard coated CR39 lenses make up the lens bank and easily fit with the frames into a single suitcase, enabling accurate dispensing in virtually any location. A small battery-powered groove cutter has been developed to position the groove for the locking pin at the correct location on the lens.
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