Posters

Comparative evaluation of the foveal avascular zone by optical coherence tomography angiography using two commercial devices

Poster Details

First Author: J.Chhablani INDIA

Co Author(s):    P. Dave   K. Dansingani   A. Jabeen   A. Jabeen   M. Ali   K. Vupparaboina              

Abstract Details



Purpose:

To perform comparative evaluation of foveal avascular zone (FAZ) geometry in healthy eyes as imaged by two commercially available optical coherence tomography angiography (OCT-A) devices.

Setting:

Tertiary eye car centre

Methods:

To perform comparative evaluation of foveal avascular zone (FAZ) geometry in healthy eyes as imaged by two commercially available optical coherence tomography angiography (OCT-A) devices.

Results:

The intra-observer repeatability for the DRI-OCT was 0.95 (95%CI, 0.90–0.98) for observer A and 0.92 (95% CI 0.83–0.96) for observer B. The intra-observer repeatability for the Cirrus 5000 was 0.988 (95% CI, 0.972–0.995) for observer A and 0.993 (95% CI, 0.983–0.997) for observer B. The inter-observer variability between observer A and B for the DRI-OCT was 0.87 (0.73–0.94) and for the Cirrus 5000 was 0.984 (95% CI 0.964–0.993). Poor inter-device agreement (0.205 (95% CI, -0.202 – 0.554)) was noted and conversion formulae were devised to convert the FAZ area measurements from 1 device to another. No significant correlation was found when comparing FAZ acircularity indices between devices (p=0.39).

Conclusions:

Repeatable and reproducible FAZ area measurements were obtained with each respective OCT-A device, but inter-device agreement was poor, yet quantifiable and systematic with calculable conversion factors between devices.

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