| The Effects of Dry Eye on the Corneal Thickness Measured by Orbscan and Ultrasonic Pachymetry. |
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Yong Sub Han, Jae Hong Ahn, Ho Min Lew |
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Department of Ophthalmology, Ajou University School of Medicine, Korea. ajoueye@madang.ajou.ac.kr |
| 건성안이 Orbscan과 초음파 각막두께측정계의 측정치에 미치는 영향 |
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한용섭 ( Yong Sub Han ) , 안재홍 ( Jae Hong Ahn ) , 유호민 ( Ho Min Lew ) |
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| Abstract |
PURPOSE
To evaluate the effect of dry eye on the corneal thickness measured by Orbscan and ultrasonic pachymetry. METHODS: The central corneal thickness was measured by both ultrasonic and Orbscan pachymetry in 30 eyes with dry eye (dry eye group) and in 30 eyes of normal subjects (control group). Dry eye was diagnosed when a Schirmer test result was less than 10 mm (after topical anesthesia) and the test for tear osmolarity was also performed. RESULTS: Tear osmolarity was 364.4+/-42.9 mOsm/L in dry eye group and 337.8+/-34.5 mOsm/L in control group. It was significantly higher in dry eye group than in the control group (p=0.011). Mean central corneal thickness measured by Orbscan pachymetry was 547.5+/-27.3 microgram in dry eye group and 562.0+/-20.4 microgram in the control group. It was significantly thinner in dry eye group than in the control group (p=0.023). Mean central corneal thickness measured by ultrasonic pachymetry was 535.7+/-27.2 microgram in dry eye group and 547.6+/-20.1 microgram in the control group with out significant difference between the two groups (p=0.059). CONCLUSIONS: The corneal thickness measured by ultrasonic pachymetry is less affected by dry eye compared to that measured by Orbscan pachymetry. |
| Key Words:
Central corneal thickness;Dry eye;Orbscan;Ultrasonic pachymetry |
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