title: Pupil dependency of bifocal contact lenses.
abstract: The advantages and the problems associated with use of alternating vision and simultaneous vision bifocal contact lenses are analyzed. The changes in pupil diameter associated with changes in illumination and in the distance of the task make the selection of the best bifocal design complex.
mesh_terms: D000328:Adult; D000375:Aging / Q000502:physiology; D003261:Contact Lenses; D005143:Eyelids / Q000502:physiology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008962:Models, Theoretical; D011680:Pupil; D014785:Vision, Ocular / Q000502:physiology