Abstract
To investigate the effects of spectacle and telescope corrections on visual acuity (VA), contrast sensitivity (CS) and reading rates (RR) in students with oculocutaneous albinism (OCA). An observational study design was conducted on 81 students with OCA. Distance and near VA, CS and RR were measured without correction, with spectacle correction and with a combination of spectacle correction and telescopes. The mean distance and near VA values with a combination of spectacle correction and telescopes were significantly better than those without correction and with spectacle correction alone (p = 0.01). Mean CS values achieved with spectacles alone were significantly better than those obtained with a combination of spectacles and telescopes (p = 0.01). There was no significant difference between logCS values obtained without correction compared to those obtained with a combination of spectacle correction and telescopes. There were no significant differences between RR values obtained with a combination of spectacles and telescopes and those without and with spectacle correction alone (all p > 0.05). This article provides valuable information to eye care practitioners on the effects of spectacles and telescopes on visual acuity, contrast sensitivity and reading rate in students with OCA.
Highlights
Albinism is a genetic disorder that results from a reduced production of pigment in the skin, eyes and hair.[1]
Distance and near visual acuity (VA), as well as contrast sensitivity (CS) values measured with a combination of spectacle correction and telescopes were not significantly associated with the age of students
Distance VA measured for the right eye (RE) with a combination of spectacle correction and telescopes showed a statistically significant relationship (p = 0.04) with the prior use of telescopes
Summary
Albinism is a genetic disorder that results from a reduced production of pigment in the skin, eyes and hair.[1]. Optical and non-optical assistive devices, including but not limited to, spectacles, magnifiers, lighting variations and contrast enhancers, can significantly improve their functional vision. This may be expected as spectacles improve vision by correcting refractive error, while telescopes improve vision by magnifying the images of objects to a size that the individual isable to perceive. A VA of 20/40 (6/12) (0.3 logMAR) is assumed to be sufficient for performing most tasks at distance,[2,3] while a print size of 20/50 (6/15) (1M) (0.4 logMAR) at near is generally used as a goal VA in determining near magnification.[4] it may be possible for patients to achieve better distance and near VA values than the above-mentioned goal VA values with the use of assistive devices
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