The Study on The Near Point in Koreans

ABSTRACT

The near point of accommodation of 500 normal Koreans aged 8 to 70 was measured for the monocular and binocular states. Push-up method with Slataper's one-two line card was used. Calculation for the nearpoint was measured by Prince rule with AD phoropter. The results were divided into 15 age groups as follows; 1. The age group of 8 to 11 ; The rangeof monocular accommodative power was 17.2D. to 12.3D. The mean value was 15.2D. The range of binocular accommodative power was 19.2D. to 14.2D. The mean value was 17.4D. The excess of binocular accommodative power was 2.2D. 2. The age group of 12 to 15 ; The range of monocular accommodative power was 15.2D. to 10.4D. The mean value was 13.8D. The range of binocular accommodative power was 18.8D. to 13.9D. The mean value was 15.4D. The excess of binocular accommodative power was 1.6D. 3. The age group of 16 to 19 ; The range of monocular acocmmodative power was 14.8D. to 9.8D. The mean value was 12.3D. The range of binocular accommodative power was 17.6D. to 12.4D. The mean value was 13.7D. The eXcess of binocular accommodative power was 1.4D. 4. The age group of 20 to 23 ; The range of monocular accommodative power was 13.4D. to 8.8D. The mean value was 11.2D. The range of binocular accommodative power was 15.9D. to 10.8D. The mean value was 12.6D. The excess of binocular accommodative power was 1.4D. 5. The age group of 24 to 27 ; The range of monocular accommodative power was 12.8D. to 8.0D. The mean value was 10.4D. The range of binocular accommodative power was 13.7D. to 9.2D. The mean value was 11.8D. The excess of binocular accommodative power was 1.4D. 6. The age group of 28 to 31 ; The range of monocular accommodative power was 12.0D. to 7.4D. The mean value was 9.5D. The range of binocular accommodative power was 12.8D. to 8.6D. The mean value was 10.8D. The excess of binocular accommodative power was 1.3D. 7. The age group of 32 to 35 ; The range of monocular accommodative power was 11.4D. to 6.6D. The mean value was 8.8D. The range of binocular accommodative power was 11.9D. to 7.9D. The mean value was 10.0D. The excess of binocular accommodative power was 1.2D. 8. The age group of 36 to 39 ; The range of monocular accommodative power was 10.2D. to 5.3D. The mean value was 7.2D. The range of binocular accommodative power was 11.2D. to 6.8D. The mean value was 8.4D. The excess of binocular accommodative power was 1.2D. 9. The age group of 40 to 43 ; The range of monocular accommodative power was 8.2D. to 3.8D. The mean value was 5.4D. The range of binocular accommodative power was 9.7D. to 5.0D. The mean value was 6.4D. The excess of binocular accommodative power was 1.0D. 10. The age group of 44 to 47 ; The range of monocular accommodative power was 7.8D. to 2.3D. The mean value was 4.1D. The range of binocular accommodative power was 9.1D. to 3.4D. The mean value was 4.9D. The excess of binocular accommodative power was 0.8D. 11. The age group of 48 to 51 ; The range of monocular accommodative power was 4.0D. to 1.2D. The mean value was 2.0D. The range of binocular accommodative power was 6.2D. to 1.6D. The mean value was 2.8D. The excess of binocular accommodative power was 0.8D. 12. The age group of 52 to 55 ; The range of monocular accmmodative power was 2.7D. to 0.9D. The mean value was 1.8D. The ranie of binocular accommodative power was 4.3D. to 1.0D. The mean valae was 2.0D. The excess of binocular accommodative power was 0.5D. 13. The age group of 56 to 59 ; The range of monocular accomIllodative power was 1.8D. to 0.7D. The mean value was 1.0D. The range of binocular accommodative power was 2.8D. to 0.7D. The mean value was 1.5D. The excess of binocular accommodative power was 0.5D. 14. The age group of 60 to 63 ; The range of monocular accommodative power was 1.2D. to 0.4D. The mean value was 0.7D. The range of binocular accommodative power was 1.8D. to 0.5D. The mean value was 1.0D. The excess of binocular accommodative power was 0.3D. 15. The age group of 64 to 70 ; The range of monocular accommodative power was 1.0D. to 0.2D. The mean value was 0.6D. The range of binocular accommodative power was 1.6D. to 0.4D. The mean value was 0.8D. The excess of binocular accommodative power was 0.2D. The human ocular occommodative power was decreased according to the increasing age. The binocular accommodative power was larger than the monocular accommodative power. The excess between binocular and monocular accommodative power was also decreased according to the increasing age. In all age group, the mean excess between binocular and monocular accommodative power was about 1.0 diopter that was more or less larger than the Duane's. In the age group of 50 years below, these values were larger than the Duane's. In the age group of 50 years above, these values were similar to the Duane's.