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KMID : 1159320130150010029
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Korean Journal of Vision Science
2013 Volume.15 No. 1 p.29 ~ p.37
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Comparison of contrast sensitivity with correction of residual refractive error and addition of yellow filter in normal and post corneal refractive surgery subjects
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Song Sun-Jung
Mah Ki-Choong
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Abstract
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Purpose: To compare of contrast sensitivity at correcting with yellow filter and residual refractive error in a corneal refractive surgery group and anon-operative group. Methods: 34 subjects(mean age: 20~29) had not ocular diseases and color vision defects, and monocular and binocular visual acuity were more than 0.8(20/25). 20subjects(mean age: 27.6 ±4.1, male: 7, female: 13) of the operative group had history of corneal refractive surgery and a residual refractive error. 14 subjects(mean age: 25.8 ±6.4, male: 11, female: 3) of the non -operative group had not history of surgery and had aresidual refractive error. Contrast sensitivity using a Mesoptometer (Mesotest II b. Oculus, Germany) measured with four conditions of wearing yellow filter and correction of residual refractive error. Results: Contrast sensitivity of the operative group were decreased in all cases that used a yellow filter compared with naked eye(9<0.01)and were not improved significantly with correction of residual refractive error. Contrast sensitivity at correcting residual refractive error were decreased in all cases that used a yellow filter(p<0.05). But in case of wearing 500/550nm cut-off 18$ filter only, the difference showed no significance(p=0.06). Contrast sensitivity of the non- operative group were decreased in all cases that used yellow filter compared with naked eye. Wearing of 540nm cut-off 18% and 35% filters showed significant decrease(p<0.05). Compared with after correction of residual refractive error, contrast sensitivity were decreased in all cases that used yellow filter after correction of residual refractive error, but only wearing 540nm cut-off 35% filter showed significant decrease(p=0.02). Contrast sensitivity of non-operative group were higher than of operative group when residual refractive error was corrected and that used a yellow filter after correction of residual refractive error(p<0.05). But contrast sensitivity with wearing yellow filter in uncorrected eye showed no significant difference between both groups. Conclusions: To improve night vision with reducing glare in corneal refractive surgery patients, it is considered that the residual refractive error need to be corrected, and then would be effective to use adequate yellow filter additionally.
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KEYWORD
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Corneal refractive surgery, Residual refractive error, Yellow filter, Contrast sensitivity
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