정상안압녹내장의 시야손상 진행과각막생체역학인자의 관련성
The Association Between Corneal Biomechanical Properties and Progression of Visual Field Loss in Normal Tension Glaucoma
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목적: 정상안압녹내장의 시야손상 진행과 각막생체역학인자 간의 관련성에 관하여 알아보고자 하였다. 대상과 방법: 약물 치료 중인 정상안압녹내장 환자 73명 73안을 대상으로 시야검사상 시야손상이 진행한 군과 진행하지 않은 군을 나누어 Ocular response analyzer (ORA)를 이용하여 측정한 각막생체역학인자를 비롯한 위험인자를 비교 분석하였다. 결과: 전체 정상안압녹내장 73안 가운데 약물 치료 후 시야손상이 진행했던 환자는 26안이었다. 시야진행군 26안과 시야비진행군 47안을 분석한 결과, 시야진행군에서 고혈압의 비율이 시야비진행군에 비해 유의하게 높았고(42.3%, 17.0%, p=0.03), corneal hysteresis (CH)와 corneal resistance factor (CRF)는 시야비진행군에서 9.8 ± 1.5 mmHg, 10.4 ± 1.4 mmHg였고 시야진행군에서 9.1 ± 1.3mmHg, 9.5 ± 1.5 mmHg로 시야진행군에서 유의하게 낮았다(p=0.03, p=0.01). CH, CRF, 그리고 고혈압이 단변량분석에서 시야진행과 유의한 연관성을 보였으며, 이 중 다변량분석을 통해서도 통계적으로 유의했던 인자는 고혈압과 CH였다. 결론: ORA를 통한 CH 측정은 정상안압녹내장의 시야손상 진행과 유의한 관련성이 있었다. 낮은 CH일수록 시야손상 진행의 위험도가높은 것으로 분석되었다.
Abstract
Purpose: To evaluate the association between corneal biomechanical properties and progression of visual field loss in normal tension glaucoma. Methods: This study enrolled 73 eyes of 73 patients with normal tension glaucoma who were undergoing medical treatment,and classified them into progressing and nonprogressing groups by visual field trend analysis. The corneal biomechanical properties measured by the Ocular Response Analyzer (ORA; Reichert Instruments, Depew, NY, USA), central corneal thickness, and Goldmann applanation tonometry were comparatively analyzed between the 2 groups. Results: Twenty-six eyes reached a progression endpoint. The prevalence of hypertension was higher in the progressing group (42.3%, progressing, 17.0%, nonprogressing; p = 0.03). Progressing eyes had lower corneal hysteresis (9.1 ± 1.3vs. 9.8 ± 1.5 mm Hg, p = 0.03) and lower corneal resistance factor (9.5 ± 1.5 vs. 10.4 ± 1.4 mm Hg, p = 0.01) compared with nonprogressing eyes. Upon multivariate analysis, the presence of hypertension (odds ratio [OR] = 3.46, p = 0.03) and corneal hysteresis (CH) (OR = 0.66 per mm Hg lower, p = 0.02) remained statistically significant. Conclusions: The CH measurement with ORA was significantly associated with risk of visual field progression in normal tension glaucoma. Eyes with lower CH had a greater risk of progression of visual field loss than those with higher CH.
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