What question did this study set out to answer?

This research aims to relate the changes in front and back radii of curvature in hydrogel contact lenses during flexing.

March 21, 2026

A General Relation Between Changing Surface Radii of Flexing Soft Contact Lenses

Puntos clave

This research aims to relate the changes in front and back radii of curvature in hydrogel contact lenses during flexing.
Discusses existing models of curvature changes in hydrogel lenses.
Develops a new relation based on observed lens behavior.
Examines the impact of lens design on curvature changes.
Establishes that Δ r 1 /Δ r 2 = 1 – 0.05 F for unflexed lens back vertex power.
Suggests lens design affects the constant relating front and back curvature changes.

Resumen

ABSTRACT 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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