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Originally published In Press as doi:10.1167/iovs.07-1452 on April 30, 2008
 (Investigative Ophthalmology and Visual Science. 2008;49:3741-3746.)
© 2008 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.07-1452
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Quantification of Metamorphopsia in Patients with Macular Hole

Kristian Krøyer,1 Ulrik Christensen,1 Michael Larsen,1,2 and Morten la Cour1

1From the Department of Ophthalmology, Glostrup Hospital, University of Copenhagen, Copenhagen, Denmark; and the 2National Eye Clinic, Kennedy Center, Copenhagen, Denmark.

PURPOSE. To describe a novel method for the evaluation of metamorphopsia within the central 10° of the visual field in 55 patients with idiopathic macular hole. The test evaluates the interocular disparity between the two eyes in metamorphopsia.

METHODS. Semicircular test and reference stimuli of variable diameters were used in a binocular test that measured interocular size disparity between perceptually iseikonic stimuli in subjects with a unilateral macular hole. A group of 11 healthy subjects was used as the reference.

RESULTS. In 55 patients with a macular hole, interocular disparity demonstrated a mean value of 0.71° with stimuli in the range 1.0° to 2.5° in diameter. This number declined to 0.41° with stimuli in the range of 9.0° to 10.0° in diameter. Both hole diameter and eccentricity had a significant effect on mean disparity (P < 0.001).

CONCLUSIONS. The level of metamorphopsia declined as a function of eccentricity and affected the central 10° of visual field. Macular hole size had an independent effect on interocular disparity. These results confirm reports that visuospatial distortion in the presence of macular hole is primarily the result of radial displacement of photoreceptors. (ClinicalTrials.gov number, NCT00302328.)






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