title: A model to explain the effect of soft lens design specifications on movement.
abstract: A model is presented which explains the movement of a contact lens in terms of its primary design specifications. The model is supported by clinical evidence. The interrelation between lens thickness, sagittal depth, and diameter is explained. The model explains why fewer base curves are needed as lens thickness is reduced.
mesh_terms: D003263:Contact Lenses, Hydrophilic / Q000592:standards*; D004548:Elasticity; D006801:Humans; D008962:Models, Theoretical; D009038:Motion