| Factors Affecting the Ocular Response Analyzer Parameters in Normal Korean. |
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Seong Wook Kim, Sung Gwan Seo, Jun Her, Soo Jeong Park |
1Department of Ophthalmology, Inje university, Pusan Paik Hospital, Busan, Korea. seossg@hanmail.net
2Crystal Eye Hospital, Busan, Korea. |
| 정상 한국인 각막의 생체역학적 요소의 정상범위와 영향을 미치는 요인 분석 |
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김성욱1ㆍ서성관1ㆍ허준1ㆍ박수정2 |
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Department of Ophthalmology, Inje university, Pusan Paik Hospital1, Busan, Korea Crystal Eye Hospital2, Busan, Korea |
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| Abstract |
PURPOSE
To identify the normal range of factors which can be measured with Ocular Response Analyzer (ORA, Reichert Inc., Depew, NY, USA) in normal Korean, and to analyze factors affecting ORA by measuring intraocular pressure (IOP) of noncontact tonometer (NCT) and central corneal thickness (CCT). METHODS: Three hundred and one normal Korean subjects who did not have specific ophthalmological diseases and surgeries in the past were recruited for this study. Corneal hysteresis (CH), corneal response factor (CRF), corneal-compensated IOP (IOPcc), and Goldmann correlated IOP (IOPg) were measured using ORA. In addition, IOP of NCT and CCT were measured and the results and factors analyzed. RESULTS: The mean CH measured among normal Korean subjects in this study was 10.70 mmHg. The mean CRF was 10.40 mmHg. CH and CRF were significantly higher in the juvenile group. IOPcc and IOPg as measures of IOP using the ORA had significant correlation with IOP of NCT. In particular, IOPcc appeared to be independent of CCT. CONCLUSIONS: CH and CRF were different according to age, indicating a difference in biomechanical properties of the cornea. In particular, IOPcc is more important as it is independent of corneal thickness and should be compensated in general measurements of IOP reflecting biomechanical properties. |
| Key Words:
Central corneal thickness;Corneal hysteresis;Intraocular pressure;Non contact tonometer;Ocular response analyzer (ORA) |
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