title: Distance visual acuity and monovision.
abstract: We have investigated aspects of visual acuity with monovision correction. Binocular distance visual acuity with monovision was approximately equal to monocular visual acuity for addition powers (monocular defocus) of +1.00 to +2.50 D, using both high and low contrast logMAR visual acuity charts. Neither the eye chosen to be defocused (dominant or nondominant) or pupil size (3.5, 5 and 7 mm) affected the binocular visual acuity loss with monovision for high contrast charts. We also investigated the effect of induced residual astigmatism (+0.50, +1.00, and -1.00 D) on binocular distance visual acuity in monovision correction. Residual astigmatism caused a significantly greater reduction of binocular visual acuity in the monovision condition than it did in normal binocular conditions. This effect appears to be related to a process of meridional interocular suppression. It may therefore be of clinical importance to correct low amounts of residual astigmatism in monovision corrections to provide optimum binocular visual acuity.
authors.affiliation: Centre for Eye Research, School of Optometry, Queensland University of Technology, Brisbane, Australia.
authors.forename: M
authors.initials: M
authors.lastname: Collins
authors.forename: A
authors.initials: A
authors.lastname: Goode
authors.forename: B
authors.initials: B
authors.lastname: Brown
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000503:physiopathology; D004215:Distance Perception / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D015348:Vision, Binocular / Q000502:physiology; D015349:Vision, Monocular / Q000502:physiology*; D014792:Visual Acuity / Q000502:physiology*