title: Simulating decreased visual acuity with a contact lens system.
abstract: We use a soft contact lens with a central depression into which a hard contact lens can be fitted to simulate conditions that cause decreased visual acuity. This "piggy-back" system can simulate central scotoma, various peripheral field defects, and opacities of the media.
mesh_terms: D003261:Contact Lenses; D003263:Contact Lenses, Hydrophilic / Q000592:standards*; D005901:Glaucoma / Q000503:physiopathology; D006801:Humans; D009885:Ophthalmology / Q000193:education; D010353:Patient Education as Topic / Q000379:methods; D012607:Scotoma / Q000503:physiopathology; D014792:Visual Acuity