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KMID : 1011420120170030265
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Journal of Korean Ophthalmic Optics Society
2012 Volume.17 No. 3 p.265 ~ p.272
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A Comparative Study on the Effects of Wearing Reverse Geometry Lenses by Degrees of Myopia
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Yoon Min-Hwa
Lee Ki-Young
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Abstract
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Purpose: To compare the results on myopia correction with reverse geometry lenses, effects of wearing reverse geometry lenses were evaluated for the children with low-level and high-level myopia.
Methods: The research investigated the corrective effects of having worn reverse geometry lenses for one week, one month, three months and six months on a total of thirty-six persons (sixty-two eyes) between the ages of seven and fifteen, divided into three groups by the degree of their myopia; nineteen eyes(Group One) with myopia of ?2.00 D and under, twenty-eight eyes(Group Two) with myopia between ?2.25 D and ?4 D, and fifteen eyes(Group Three) with myopia of ?4.25 D and above; as shown by changes in uncorrected vision and the degree of refraction in the corneal topography, and tested for statistical similarity among the pursued results.
Results: After wearing reverse geometry lenses, Group One showed an improvement in vision of 0.5, from 0.45 to 0.95, after one week, and improvements to 0.91 after one month and 1.02 after three months but, after six months, the group’s vision regressed to 0.95. Group Two showed an improvement in vision of 0.43, from 0.34 to 0.77, after one week of wearing and to 0.91 after one month, to 0.97 after three months and this was statistically maintained through the remainder of six months. Group Three showed an improvement in vision of 0.55, from 0.15 to 0.7, after wearing for one week, to 0.87 after one month and to 0.91 after three months but saw a regression to 0.86 after six months. The average Sim K (simulated keratometry reading) value for Group One started from 42.84±1.17 D and decreased to 41.48±0.98 D after one week of wearing and continued declining through three months before increasing during the remainder of six months. Group Two began from 42.91±1.57 D and recorded 41.78±1.58 D after one week, continuing the decline through three months before increasing during the remainder of six months. Group Three began at 42.64±1.64 D and showed its Sim K value decrease to 40.77±1.20 D after one week of wearing, increase after one month and decrease after three months and continue the decline through the remainder of six months.
Conclusions: From the results of this study, wearing reverse geometry lenses had myopia-correcting effects after one week of wearing. Although there were variations in the time for such effect to take place but myopia-correcting effects were evident in all test groups.
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KEYWORD
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Reverse geometry lenses, myopia-correcting effects, Corneal topography, Degree of refraction
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