Abstract
Anew bifocal contact lens uses the simultaneous vision principle but divides the incident light in a novel way. Instead of the usual division of the aperture into near segment and distance segment this new lens uses diffraction to divide the amplitude of the light. Both images therefore use light from the whole aperture restricted only by the natural pupil. This ‘full aperture’ bifocal contact lens is capable of excellent visual acuity at near and distance over a wide range oflight levels. The optical principles and visual characteristics of the lens will be described.
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