| Average Presbyopic Additions for Various Age Groups in Korean. |
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Si Uk Kim, Ouk Choi |
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Department of Ophthalmology, Yonsei University, College of Medicine, Seoul, Korea. |
| 한국인 노안의 연령에 따른 근용 첨가도 |
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최억(Ouk Choi),김시욱(Si Uk Kim) |
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| Abstract |
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As a gradual loss of elasticity of lens with advancing age, the power of accomodation becomes progressively smaller, and eventually the near-point has receded beyond the distance which causes difficulty in seeing near object clearly. This condition is known as presbyopia. Presbyopia is treated by means of convex lenses added to the distance correction. The power of the lens required for clear vision for near work varies with an individual's habits, age, occupation, length of arms, and accustomed distance of doing near work. A rule of thumb method for prescribing presbyopic additions has been presented respectively by Lyle et al(May and Worth's manual of diseases of the eye), and by Sloane(Approximate average adds for various age groups). Average presbyopic additions had been investigated in 869 healthy Koreans with normal visual acuity over age 41 from November 1, 1969 to October 31, 1981. The results were as follows: 1. The rate of the patients for whom presbyopic additions were not ordered; between ages of 41 and 45: 30.4% of emmetropia, 51. 5% of myopic refractive error, 10.4% of hyperopic refractive error, 20.0% of others, between ages of 46 and 50: 5. 1 % of myopic refractive error, 2.1% of hyperopic refractive error. 2. The average presbyopic additions for various age groups based upon the 95% statistical reliability were as follows; 41 to 45: + 1.00D or + 1.25D, 46 to 50: + 1.50D or + 1.75D, 51 to 55: + 2.00D, 56 to 60: + 2.25D or + 2.50D, 61 to 65: + 2.50D 66 to 70: + 2.75D. |
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