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Abstract #12079 Published in IGR 7-1
Analysis of HRT-II parameters in myopic refractive error eyes
Qiao R; Li M; Ren Z; Pan YChinese Ophthalmic Research 2005; 23: 89-91
OBJECTIVE: To evaluate characteristics of optic disc parameters in myopia with Heidelberg retina tomography. METHODS: The refraction and Confocal Scanning Laser Ophthalmoscopy (HRT-II, software: version 1.6) were taken in 61 subjects with the diopter of -0.25 to -14.75 D, and one eye of each subject was selected for a randomly non-controlled investigation. The height variation in Z axis between nasal and temporal margins (HVNT) was measured by coordinate system to predict the rotation of optic disc around Y axis (i. e. disc shape changing). The correlations between HVNT and refraction values, 14 disc parameters and refraction values, certain parameters and HVNT were analyzed, and simple linear regression analysis were performed for linearly correlated parameters. RESULTS: HVNT was correlated with myopic refractive error (r = 0.46, P < 0.01). Among 14 optic disc parameters, rim volume, height variation contour, mean RNFL thickness, RNFL cross sectional area and reference height were positively correlated with myopic refractive error (r = 0.341-0.388, P < 0.01) and showed better correlations with HVNT (r = 0.412-0.830, P < 0.01). Mean RNFL thickness increased by 0.012 mm and 0.049 mm respectively when myopia increased 1 diopter or HVNT increased 0.1 mm. CONCLUSION: Optic disc rotation caused by myopic refractive error can affect some parameters obtained using HRT-II. The disturbances are more severe in higher myopia, and it would hinder clinicians from detecting, if any, a glaucomatous disc damage in myopic patients. LA: Chinese
Dr. R. Qiao, First Hospital of Peking University, Beijing 100034, China
Classification:
6.9.1 Laser scanning (Part of: 6 Clinical examination methods > 6.9 Computerized image analysis)
8.1 Myopia (Part of: 8 Refractive errors in relation to glaucoma)
