March 2012
Volume 53, Issue 14
Free
ARVO Annual Meeting Abstract  |   March 2012
Evaluation Of Monocular Neutral Density And Yellow Filters On Reading By Patients With Symptomatic Monocular Metamorphopsia
Author Affiliations & Notes
  • Maryana Kravchenko
    PCO at Salus University, Elkins Park, Pennsylvania
  • Stephen Sinclair
    Department of Ophthalmology, Drexel University School of Medicine, Philadelphia, Pennsylvania
  • Footnotes
    Commercial Relationships  Maryana Kravchenko, None; Stephen Sinclair, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science March 2012, Vol.53, 5440. doi:
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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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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : 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.

Methods: : 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

Results: : 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.

Conclusions: : 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.

Keywords: contrast sensitivity • macula/fovea • photoreceptors 
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