J Korean Ophthalmol Soc.  1975 Dec;16(4):352-357.

Statistic Observation of Refractive Error(III)

• Lew HM
• Kim HW
• Kim SD
• Choi O

Abstract

Among 8, 350 patients seen in the department of ophthalmology, Yonsei University Medical Center from August 1, 1968 to July 31, 1971 there were 2,313 who were seen because of refractive error. These were selected for classification and special statistical study. We reported two similar studies of 2,004 patients having errors in refraction among a total of 9,716 patients seen from August 1, 1958 to July 31, 1961 and 1,919 patients having errors in refraction among a total of 8,796 patients from August 1, 1965 to July 31, 1968 seen in the same department in 1962 and 1968 respectively. The finding of the more recently studied groups are compared with the studies made in 1962 and 1968. 1. 2,313 out of 8,350 patients seen in the department of ophthalmology had errors in refraction (27.7%). 2. 2,949 cases (63.8%) had refractive errors of the myopic type. 626 cases (13.5%) were hyperopic. The others had a simple and a mixed astigmatism. 3. 61.2% of the total group studied had astigmatism. 4. The highest incidence of refractive errors was found between 11 and 20 years of age The older patients had a low incidence. 5. Among the total number of refractive errors 56.3% were found to be in myopic patients who had less than a -3.00 diopters error. 16.8% were found among hyperopic patients who had less than a +3.00 diopters error. 6. Among the three types of astigmatic error seen 1,507 cases (53.2%) were "with the rule", 872 cases (30.8%) were "against the rule", and 456 cases (16.0%) were "oblique". 7. 6.9% of the total refractive errors were those of different types of anisometropia. The most commonly seen type was that of compound myopic anisometropia. The next type seen was simple myopic anisometropia and the least frequently seen type was compound hyperopic anisometropia. 8. When the results of the present study were compared with those found in 1962 and 1968 there are no significant difference between these three groups.

MeSH Terms

Academic Medical Centers
Anisometropia
Astigmatism
Classification
Humans
Incidence
Ophthalmology
Refractive Errors
Statistics as Topic