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Innovations improve optical precision and durability in polycarbonate lenses, suggesting enhanced vision care.
Improvements in polycarbonate material, production techniques, and scratch‐resistant coatings, combined with a process‐oriented design, have resulted in a precision lens series. Surface quality is comparable to that of untreated glass ophthalmic lenses. The repeatability of the process results in closely controlled axial power and off‐axis performance. For most lens prescriptions, the ANSI Z80.1 optical‐center specifications for prescription accuracy are maintained through a total field of view of 40 deg for an 8‐mm range of center‐of‐rotation distances. Off‐axis astigmatism is controlled for near‐point seeing. The lenses are both lighter and thinner than those of crown glass. A scratch‐resistant coating reduces the reflections normally associated with high‐index (1.586) materials. Impact resistance exceeds that required by ANSI Z80.7 and is many times that required by ANSI Z80.1.
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John K. Davis (1978) studied this question.
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