Refractive State in Young Adult with Normal Visual Acuity by Autorefractometer RM-A 6000

ABSTRACT

The autorefractometer alone without subjective refinement cannot be substituted for conventional complete refracting methods with subjective refinement. The auto refractometer can be used as a substitute for retinoscopy in determining the starting point for a subjective refraction. In this study, authors observed the prevalence, type, and degree of refractive errors in 409 eyes with normal visual acuity(20/20 or more). The results were as follows 1. The autorefractometer tended to be on the minus side that is, overestimating myopia and understimating hyperopia-in all groups. 2. In objective refraction, 247 of 409 eyes with normal visual acuity had refractive error such as simple myopia(52 eyes), simple myopic astigmatism(122 eyes), compound myopic astigmatism (29 eyes), mixed astigmatism(39 eyes), and hyperopia(5 eyes). 3. In objective refraction, visual acuity was decreased with convex lens in hyperopia, mixed astigmatism and compound astigmatism were changed into simple myopic astigmatism. 4. Degree of astigmatism were less than 0.5 diopter in majority(92.8%). 5. In subjective refraction, 97 of 190 eyes were represented as simple myopic astigmatism, while 93 of 190 were normal, 63 of 97 astigmatism were "with the rule" and 34 of 97 astigmatism were "against the rule."