title: A general relation between changing surface radii of flexing soft contact lenses.
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 (delta r1) may be related to the change in back radius (delta r2) by a simple constant which may change with lens design, and then develops a separate new general relation from observed lens behavior: delta r1/delta r2 = 1 - 0.05 F, where F is unflexed lens back vertex power.
mesh_terms: D003263:Contact Lenses, Hydrophilic; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D008962:Models, Theoretical; D055095:Optics and Photonics; D011092:Polyethylene Glycols
chemical_list: D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D011092:Polyethylene Glycols