• Journal of Korean Ophthalmic Optics Society
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• v.17 no.1
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• pp.27-35
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• 2012

Purpose: The present study was conducted to compare any difference caused by pigmentation in the centrations and movement patterns on the cornea between circle and soft contact lens with identical material and parameters during lens wearing. Methods: Soft and circle contact lenses with identical material and parameters were applied to twenty eyes with normal tear volume for 3 hrs a day during a total of 5 days and then their lens centrations, the moving distances and rotations by repeat blinking were compared. Results: The lens centration beyond the fitting criteria was shown in initial wears of both soft contact lens and circle contact lens. However, the centration of soft contact lens was changed to the pupil center for being suitable to the fitting criteria with longer wearing time. On the other hand, the decentration of circle contact lens in the horizontal direction was still presented even with longer wearing time. The moving distances of soft contact lens and circle contact lens decreased with the expand of lens wearing but were not significantly different between total wearing period and daily wearing time. The rotation of circle contact lens by repeat blinking was significantly different from that of soft contact lens even when the wearing period was extended. Conclusions: We revealed that the lens centration and movement of circle contact lens on cornea were different from those of regular soft contact lens resulting in bigger difference with the expand of wearing period in the study.

• Journal of Korean Ophthalmic Optics Society
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• v.14 no.1
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• pp.97-101
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• 2009

Purpose: To assess the refractive state of the westerners (male: 44, female: 62) in twenties who visited the A optical shop at Seoul. Methods: The visual acuity test was performed by the objective and subjective method. Results: The emmetropia and myoptia were 35 and 177 eyes (83.49%), respectively. About 26.76% of tested males was ametropia. Myopia compound and myopia simple astigmatism were found in 60.56% and 12.68% of tested males, respectively. However, about 43.40% of tested females was ametropia. Myopia compound and myopia simple astigmatism were 49.06% and 7.55% were found in tested females, respectively. As for the equivalent spheric power of myopic abnormal refractive eyes, the -0.5D < spheric equivalent ${\leq}$ -2.00D was 35.02% of tested westerners, the -2.00D < spheric equivalent ${\leq}$ -6.00D was 60.45% and anything over the -6.00D was 4.53%. The percentages of with-the-rule, against-the-rule and oblique astigmatism among people with astigmatism were 59.82%, 26.78% and 13.40%, respectively. The average of pupillary distance in male (63.5${\pm}$2.4 mm) was greater than that in female (59.7${\pm}$2.3 mm). Conclusions: Korean opticians were provided some useful information about making up a prescription for the westerners in twenties by this research.

• Journal of Korean Ophthalmic Optics Society
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• v.8 no.2
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• pp.37-45
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• 2003

This study investigated that total 1071 reading glasses wearers (male 432, female 639) without any eye disease or deformation in eyelid, orbit, eyeball (over 50 years old), were tested. Reading pupillary distance of 524 (male 202, female 322) of 1071 were examined and reading glasses power was examined for all 1071 patients. As a result of average reading diopters analysis by sex. male had S+2.34Dptr, female had S+2.23Dptr in average and male had a little more average power than female by 0.11Dptr. However, the difference was not much enough and by aging accommodation reduction changes were applied to both male and female. After dividing ready-made reading glasses on sale in optical shops into 5 groups by F.P.D. the average D.B.O.C(distance between optical centers) of each 5 group was examined (1st group 64.04 mm, 2nd group 66.96 mm, 3rd group 68.28 mm, 1th group 62.03 mm, 5th group 72.00 mm : the average of all groups was 66.96 mm : each group included 3 random samples : 195 ready-made reading glasses were measured), and compared with the average reading P.D of males and females (male 60.04 mm, female 58.23 mm). The result showed D.B.O.C of ready-made reading glasses on sale was bigger than the average reading P.D of them. The result reviewed the average range for male was $0.23{\Delta}(minimum){\sim}5.06{\Delta}(maximum)$, and for female was $0.46{\Delta}{\sim}5.79{\Delta}$. In conclusion when wearing ready-made reading glasses, female got more effected by average $0.45{\Delta}$ because reading P.D of female was smaller than that of male.