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KMID : 0360220170580010021
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Journal of the Korean Ophthalmological Society
2017 Volume.58 No. 1 p.21 ~ p.26
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Comparison of Refractive Power and Astigmatism between Digital Keratometer and Autorefractor
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Choi Jae-Won
Han Sang-Youp
Lee Kyung-Heon
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Abstract
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Purpose: To compare the corneal refraction, astigmatism, and corneal marking for toric intraocular lens measured with a VERIONⓡ Image Guided System and an autorefractor in order to precisely determine the toric intraocular lens target.
Methods: The medical records of 29 eyes of 29 patients were retrospectively reviewed to compare the corneal refraction, axis, and amount of astigmatism measured with a VERIONⓡ Image Guided System and an autorefractor. We compared the difference in marked axis for toric intraocular lenses as measured by a VERION Digital Marker and a manual marker.
Results: The average corneal refraction and amount of astigmatism were greater with the VERIONⓡ Image Guided System than with the autorefractor. The average difference in axis of astigmatism was 9.62°. The difference in axis of astigmatism in patients with more than 1.0 D of astigmatism (18 eyes) was 2.82 ± 2.27°, while that in patients with less than 1.0 D of astigmatism (11 eyes) was 20.27 ± 28.14°. The average difference in marked axis for toric intraocular lens measured by the VERIONⓡ Digital Marker and manual marker was 2.50° (0°-9.27°).
Conclusions: The corneal refraction and amount of astigmatism were significantly higher with the VERIONⓡ Image Guided System, so careful concern and comparison of surgical outcomes between the two devices is needed in biometry.
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KEYWORD
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Astigmatism, Autorefracto, Corneal refraction, Digital marker, VERIONⓡ
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