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KMID : 1159320070090040413
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Korean Journal of Vision Science
2007 Volume.9 No. 4 p.413 ~ p.421
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Evaluation of the calibration state of schematic training eye
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Ryu Dong-Kyu
Mah Ki-Choong
Lee Hae-Jung
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Abstract
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This study was performed to evaluate the calibration state of schematic eye and the accuracy of calibration according to the technical levels of the examiner.
Seven schematic training eyes with same model were set the zero mark on the graduated scale, and then +2.00 diopter trial lens was added to the schematic training eye. Neutralizing distance was measured at 180 degree meridian by one proficient retinoscopist and students of optometry who are not highly skilled yet.
Differences in refraction with automated refractor and refraction with retinoscope by retinoscopist and students at zero mark revealed significant differences in 3 of 7 schematic eyes(P < 0.05). The differences in refraction with automated refractor at zero mark were -0.41±0.07 D, -0.28±0.08 D, and -0.45±0.07 D, the differences in refraction with retinoscope by retinoscopist at zero mark were -0.49±0.10 D, -0.41±0.06 D, and -0.49±0.13 D, and the differences in refraction with retinoscope by students at zero mark were -0.17±0.14 D, -0.15±0.06 D, -0.22±0.27 D(P < 0.05).
In some schematic eyes, neutralizing point was not correct. Correct and excise calibration before training of refraction by schematic eye is important. It might be helpful training calibration of schematic eye for the students.
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KEYWORD
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Retinoscopy, Schematic eye, Calibration
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