Relationship Between Visual Acuity and Refractive Error in Myopia

ABSTRACT

The purpose of this study is to present quantitative data showing the relationship between visual acuity and refractive error in the various types of myopia simple myopia, simple myopic astigmatism and compound myopic astigmatism. 1. The study covered 681 patient (1259 eyes) examined by having refractive error in myopia. (-0.25 ~ -20.00D) the Department of Ophthalmology, Yonsei University Medical Center and Wonju Christian Hospital. 2. Plotting the logarithm of visual acuity on the logarithm of the degree of myopia gives a coefficient correlation of -0.8028. The statistical data showed significant in correlation coefficient (r) in various types of myopIa simple myopia r=-0.7789(p=0.001), simple myopic astigmatism r=-0.7877(p=0.001), compound myopic astigmatism r=-0.7537(p=0.001). 3. The coefficient of determination (R2) was 0.6445. 4. The mathematical mean of the various types of myopia a. myopIa; simple myopia 0.29(=20/60), simple myopic astigmatism 0.87(=20/25), compound myopic astigmatism 0.29(=20/60). b. visual acuity; simple myopia -2.53D, simple myopic astigmatism -0.50D, compound myopic astigmatism -3.04D. 5. The formulas for the two regression line were log V=-0.7385 log M-0.4976 (A)(F=2175.7303, p=0.001), log M= -0.8727 log V -0.3641 (B)(F=2175.7303, p=0.001). 6. Confidence limits were determined for the regression lines and table and set up for predicting either the degree of myopia or the visual acuity if the other is known.