Clara Valor Suárez, Jonathan Than, Ye Ling, Jean-Yves Guillemaut, David M Frohlich, Tom H Williamson
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The Image Warping Test: A Novel Method to Quantify and Qualify Metamorphopsia.
Purpose: To determine the validity, accuracy and acceptability of the Image Warping Test (IWT), a novel test for the measurement of visual distortion in the central visual field.
Methods: 25 volunteers with metamorphopsia secondary to vitreoretinal pathology were recruited at a tertiary referral center. All subjects underwent ophthalmological examination and measurement of metamorphopsia via Amsler grid, Morphision, M-CHARTS and the IWT. Construct validity was determined through assessment of the association between symptoms, pathology, visual acuity, established metamorphopsia test results and IWT results.
Results: There was close association between subjective estimation of metamorphopsia severity and IWT score (p=0.005), between Morphision result and IWT score (p=0.015), and between the nature of vitreoretinal pathology and IWT score (p=0.007). There was no statistically significant correlation between best corrected distance visual acuity and IWT score, and between M-CHARTS score and IWT score.
Conclusion: The IWT allows the creation of a digital map of subjective metamorphopsia which effectively measures its severity and nature, and opens the possibility to its non-invasive correction in future through inverse mapping of the distortion map onto live images.
期刊介绍:
RETINA® focuses exclusively on the growing specialty of vitreoretinal disorders. The Journal provides current information on diagnostic and therapeutic techniques. Its highly specialized and informative, peer-reviewed articles are easily applicable to clinical practice.
In addition to regular reports from clinical and basic science investigators, RETINA® publishes special features including periodic review articles on pertinent topics, special articles dealing with surgical and other therapeutic techniques, and abstract cards. Issues are abundantly illustrated in vivid full color.
Published 12 times per year, RETINA® is truly a “must have” publication for anyone connected to this field.