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KMID : 1011420130180030291
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Journal of Korean Ophthalmic Optics Society
2013 Volume.18 No. 3 p.291 ~ p.295
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Effect of Under and Over Refractive Correction on Visual Acuity Performance using Two Different Charts
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Chen Ai-Hong
Siti Salwa Mohamad Shah
Saiful Azlan Rosli
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Abstract
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Purpose: The purpose of this study was to investigate the effect of under and over refractive correction on visual acuity performance and the variation of the visual performance measurement using two different visual acuity charts.
Methods: Ten young adults, aged between 19 and 25 years old, were recruited. Inclusion criteria: no history of ocular injury or pathology with a best-corrected visual acuity of 6/6 on dominant eye. The over and under refractive corrections were induced using minus and plus spherical ophthalmic lenses in 0.50 D steps up to 3.00 D; as well as using three axis orientations of cylindrical ophthalmic lenses (45°, 90° and 180°) in 0.50 D steps. The variation of visual acuity performance measurements was investigated using Bailey-Lovie LogMAR chart and Landolt C chart.
Results: The visual acuity changes with lenses were significantly different between two charts [F = 49.15, p < 0.05 with plus spherical ophthalmic lenses and F = 174.38, p < 0.05 with minus spherical ophthalmic lenses]. The visual acuity changes with three different cylindrical axis showed no significant difference between Bailey-Lovie LogMAR chart [F = 2.35, p > 0.05] and Landolt C chart [F = 3.12, p = 0.05].
Conclusions: The over and under refractive correction affected the visual acuity performance differently. The Landolt C chart and Bailey-Lovie LogMAR chart demonstrated variation in measurements.
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KEYWORD
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Over or under refractive correction, Astigmatism axis correction error, Visual acuity chart, Visual acuity
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