Posters

Discrepancy in foveal depression location on clinical examination and OCT imaging

Poster Details

First Author: T.Murphy IRELAND

Co Author(s):    P. O'Reilly                             

Abstract Details



Purpose:

To determine discrepancy of location of the foveal depression between OCT imaging and clinical examination, to examine the frequency of same and characteristics of patients with discrepancy in foveal depression location, to determine the distance between location of foveal depression on fundal photograph and true foveal depression location on OCT scan.

Setting:

University Hospital Limerick, a tertiary level vitreo-retinal referral centre

Methods:

Macular OCT scans and corresponding fundal photographs from 1/1/16 to 6/2/17 from individual eyes were reviewed. Scans where pathology obscured foveal depression location were excluded. An examiner determined the clinical location of the fovea and foveal depression on fundal photograph for each individual eye. This was compared to the true location of the fovea and foveal depression on the OCT image obtained for the same eye. An examiner documented correspondence or discrepancy of location of foveal depression between imaging methods, and distance between foveal depression on OCT imaging and fundal photograph in eyes with location mismatch.

Results:

677 scans of individual eyes were included for review. 17 scans with discrepancy in foveal depression location on OCT and fundal photograph were identified i.e. location mismatch in 2.5% of scans. Only one patient had non correspondance of foveal location present in both eyes. 75% of cases where foveal position on fundal photograph did not correspond with true position on OCT were female. The average age of patients’ with discrepancy was 63.6 years, with an age range of 13-78 years. The measure of discrepancy between foveal depression position on OCT and fundal photograph ranged from 0.85-2.88mm, with an average distance of 1.41mm.

Conclusions:

There is a significant level of discrepancy between appearance of foveal depression on fundal photograph and actual foveal depression position on OCT image. There has been no previous documentation of same in the literature. This has a significant impact on future treatment of macular pathologies, specifically where the application of focal macular laser is concerned, as presumed perifoveal application may significantly impair vision. Further investigation is necessitated here.

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