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ORIGINAL ARTICLE
Year : 2011  |  Volume : 59  |  Issue : 1  |  Page : 9-11

Dimensions of the foveal avascular zone using the Heidelberg retinal angiogram-2 in normal eyes


1 Department of Ophthalmology, Christian Medical College, Vellore - 632002, Tamil Nadu, India
2 Department of Bioengineering, Christian Medical College, Vellore - 632002, Tamil Nadu, India

Correspondence Address:
Deepa John
Department of Ophthalmology, Schell Eye Hospital, Arni Road, Christian Medical College, Vellore - 632001, Tamil Nadu
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0301-4738.73706

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Purpose: The purpose was to study the dimensions of the foveal avascular zone (FAZ) using Heidelberg Retinal Angiogram-2 (HRA-2; Heidelberg Engineering GmBH, Dossenheim, Germany). Materials and Methods: An observational study of the FAZ area and circumference was done with fundus fluorescein angiography (FFA) using HRA-2 in 31 normal individuals. The FAZ was studied using both contrast-adjusted and nonadjusted methods. Contrast adjustment was done to obtain better visualization of the finer capillaries around the fovea enabling more precise measurements of the FAZ in normal eyes. Results: The mean area of the FAZ calculated by the contrast-adjusted method was 0.2753 mm 2 (±0.074) and the mean circumference was 2.22 mm (±0.048). By the conventional method, the area and circumference of the FAZ were 0.6241 mm 2 (±0.177) and 3.23 mm (±0.454), respectively. Conclusion: The measurements of area and circumference of FAZ using contrast-adjusted methods were significantly smaller than the conventional method.


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