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Abstract #24287 Published in IGR 11-3

Anterior segment imaging: Fourier-domain optical coherence tomography versus time-domain optical coherence tomography

Wylegala E; Teper S; Nowinska AK; Milka M; Dobrowolski D
Journal of Cataract and Refractive Surgery 2009; 35: 1410-1414


PURPOSE: To compare anterior segment measurements and morphology of 2 optical coherence tomography (OCT) systems. Setting: Department of Ophthalmology, District Railway Hospital, and the Nursing Department and Social Medical Issues, Health Care Division, Silesian Medical University, Katowice, Poland. METHODS: In normal eyes and in eyes with corneal and trabecular-iris angle disorders, the central corneal thickness (CCT), trabecular-iris angle, and angle-opening distance at the nasal and temporal angles were measured 3 times during 1 visit using the Visante time-domain OCT system and the RTVue-100 Fourier-domain corneal anterior module OCT system. Anterior segment morphology was assessed and compared. RESULTS: Fifty-four eyes were evaluated. The mean values ( ±SD) by time-domain OCT and Fourier-domain OCT were, respectively, automatic CCT, 535 ± 33.07 μm and 538 ± 31.82 μm; manual CCT, 545 ± 30.91 μm and 542 ± 30.57 μm; nasal trabecular-iris angle, 34.7 ± 9.5 degrees and 35.2 ± 8.9 degrees; temporal trabecular-iris angle, 35.3 ± 8.5 degrees and 35.5 ± 9 degrees; nasal angle-opening distance, 435 ± 95 (mu)m and 444 ± 98 μm; and temporal angle-opening distance, 443 ± 103 μm and 452 ± 99 μm. There was no significant difference between mean values, and they were highly correlated. On morphologic analysis, time-domain OCT had lower resolution; however, all anterior chamber structures were visible on 1 image. Fourier-domain OCT provided precise information about small areas of the anterior chamber. CONCLUSION: Fourier-domain OCT provided accurate anterior eye segment measurements that agreed with those obtained with time-domain OCT.

Dr. A.K. Nowinska, Department of Ophthalmology, District Railway Hospital, Nursing Department and Social Medical Issues, Katowice, Poland. atrum2@gmail.com


Classification:

6.9.2.1 Anterior (Part of: 6 Clinical examination methods > 6.9 Computerized image analysis > 6.9.2 Optical coherence tomography)



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