| Comparison of Macular Thickness Measurements Between Fourier-Domain and Time-Domain Optical Coherence Tomography in Normal Eyes and Eyes With Macular Diseases. |
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Byoung Woo Ko, Yong Woon Shin, Jeong Min Lee, Yumi Song, Byung Ro Lee |
1Department of Ophthalmology, College of Medicine, Hanyang University, Seoul, Korea. brlee@hanyang.ac.kr
2Department of Ophthalmology, GwangMyeong Sungae Hospital, Gwangmyeong, Korea. |
| 정상안과 황반질환 안의 퓨리에 도메인과 시간 도메인 빛간섭단층촬영에 의한 황반두께 비교 |
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고병우1ㆍ신용운1ㆍ이정민2ㆍ송유미1ㆍ이병로1 |
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Department of Ophthalmology, College of Medicine, Hanyang University1, Seoul, Korea Department of Ophthalmology, GwangMyeong Sungae Hospital2, Gwangmyeong, Korea |
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| Abstract |
PURPOSE
To define and measure macular thickness and volume using Fourier domain OCT (FD OCT) and compare the values with Stratus OCT in normal eyes and eyes with macular disease. METHODS: On the same day, macular thicknesses of the ETDRS 9 subfield and total macular volumes were measured in 35 eyes of 23 normal subjects and 19 diseased eyes of 24 patients with FD OCT and Stratus OCT. The macular cube scan protocol for FD OCT and the fast macular thickness map protocol for Stratus OCT were used to measure macular thicknesses. RESULTS: Foveal thickness of the central subfield in FD OCT (251.49+/-79.45 micrometer) was thicker than the value of Stratus OCT (210.26+/-60.57 micrometer) (p<0.001) in all eyes. Total macular volume was 7.72+/-1.06 mm3 and 7.04+/-0.96 mm3 for FD OCT and Stratus OCT, respectively (p<0.001). Retina thickness of the ETDRS 9 subfields in FD OCT was thicker than the value obtained using Stratus OCT. In addition, foveal thickness differences were statistically significant in both the normal and diseased eye groups. CONCLUSIONS: Macular thickness and total macular volume as measured by the FD OCT were larger than the values obtained using the Stratus OCT in both the normal and the diseased eye groups. The measuring algorithm of FD OCT defines the top of RPE as the outer retinal boundary, but Stratus OCT defines the outer retinal boundary as the IS/OS junction of the photoreceptor. Therefore, macular thicknesses of FD OCT are thicker than those of Stratus OCT. This difference should be considered when comparing the results of FD OCT with those of Stratus OCT. |
| Key Words:
Fourier domain OCT;Macular thickness;Macular volume;Stratus OCT |
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