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Maryana Kravchenko, Stephen Sinclair; Evaluation Of Monocular Neutral Density And Yellow Filters On Reading By Patients With Symptomatic Monocular Metamorphopsia. Invest. Ophthalmol. Vis. Sci. 2012;53(14):5440.
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To assess in patients with monocular metamorphopsia the effect on reading of placing a Neutral Density Filter (NDF) over the affected eye and a yellow filter (YF) over the fellow eye.
Patients were enrolled with monocular metamorphopsia that were symptomatic during near tasks with monocular retinal pathology accounting for the distortion and vision that was 20/125 or better in the affected eye and 20/40 in the fellow eye. Utilizing optimum, off-axis lighting, the Pepper Visual Skills for Reading Test (PVSRT) was performed three times utilizing (1) the habitual reading correction only, (2) habitual readers with a NDF over the eye experiencing metamorphopsia and (3) readers, NDF and a yellow filter (YF) over the fellow eye. A 5% yellow bandwidth filter was utilized. Changes in reading rates and accuracy were calculated between the three sessions
Eight patients were evaluated, aged 62 to 84 (mean 73) with monocular metamorphopsia caused by a variety of retinal pathologies. Compared with reading correction only, NDF placed over the affected eye produced no change in the total number of correct items read (+ 0.25 +/-1.98 words), no change in reading accuracy (0.4% +/-2.41 correct items read), and barely significant improvement in reading rates (12.54 +/- 13.50 words read correctly per minute). The combination of the NDF with a yellow filter produced a barely significant improvement in the total number of correct items read (1.13 +/- 1.13), a minimal improvement in reading accuracy (1.04% +/- 1.38) and a barely significant improvement in reading rate (12.73 +/- 14.13). Subjective improvement in comfort level while reading was reported by 7 of the 8 patients with the NDF, and 8 of 8 with the combination of filters.
While reading rates and accuracy were minimally improved, subjective reading comfort was noted with the utilization of the NDFover the affected eye and a yellow filter over the fellow eye. A clip-on with these lenses appears to make reading previously limited by visual disparity created by unilateral metamorphopsia more comfortable.
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