Title: A Novel Method of measuring metamorphopsia in macular diseases using computerised D charts
Authors: Dr Hema M Mer, Dr Ajay Dudani, Prof. Niall Strang, Dr Sven Jonuscheit
DOI: https://dx.doi.org/10.18535/jmscr/v6i9.112
Abstract
Purpose: This study examines the ability of the computerised D chart to detect and quantify metamorphosis in different macular disorders and compare the results with other clinical measurements such as visual acuity, Amsler chart and Optical Coherence Tomography (OCT).
Methodology: A software version of D charts uses octagonal grids with varying eccentricities from 0.5 to 12 degrees from fixation. Subjects do fixation by focussing at the centre of the D-charts and locate the area of distortion by touching the screen. The sector was highlighted by a blue line and later the software determines MScore, Mtotal, Marea for each ring. D Chart measures were undertaken on 30 subjects and the results were compared to LogMAR visual acuity, Amsler chart and OCT.
Results: Computerised D-Chart is easy to use and there was no correlation between MScore and VA, MScore and CSF (p>0.05). There was a correlation between MScore and Amsler. (r=0.806 p=0.000163). Both cases showed similarities in the structural and functional details of metamorphopsia.
Conclusion: D charts allowed quantification of metamorphopsia in macular disease patients with variable visual acuities. It is one of the most important diagnostic tools to map distortion and central field loss and may be helpful in assessing ongoing macular diseases.
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