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A study on lens flexing reveals a new relation in the curvature of hydrogel lenses, suggesting design implications.
Many models have been proposed to describe the simultaneous changes which occur in front and back radii of curvature of a hydrogel contact lens flexing or “wrapping” onto the surface of a human eye. This study first discusses the concept that the change in front radius (Δ r 1 ) may be related to the change in back radius (Δ r 2 ) by a simple constant which may change with lens design, and then develops a separate new general relation from observed lens behavior: Δ r 1 /Δ r 2 = 1 – 0.05 F, where F is unflexed lens back vertex power.
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Barry A. Weissman (1984) studied this question.
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