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Quantification of metamorphopsia in patients with epiretinal membranes
Chota Matsumoto1, Eiko Arimura, Sachiko Okuyama
1Department of Ophthalmology, Kinki University School of Medicine, Osaka, Japan. chota@med.kindai.ac.jp
Purpose:
To quantify the degree of metamorphopsia in patients with idiopathic epiretinal membranes (ERMs), by use of a new metamorphopsia chart (M-CHARTS) developed by the authors.
Methods:
These M-CHARTS had 19 dotted lines with dot intervals of between 0.2 degrees (fine) and 2.0 degrees (coarse) visual angles. As the dot intervals were changed from fine to coarse, a decrease in the severity of metamorphopsia was noted. In this study, the minimum visual angle of the dotted lines needed to cause the metamorphopsia to disappear was measured in 51 eyes of 51 patients with ERM. The metamorphopsia scores were compared with the stages of ERM classified by scanning laser ophthalmoscope (SLO) images.
Results:
In patients with ERM, the metamorphopsia score increased depending on the severity of membrane proliferation classified by SLO images. The scores obtained from the horizontal dotted lines were larger than those of the vertical lines in advanced stages of ERM.
Conclusions:
M-CHARTS provide a very simple and useful method for evaluating the severity of metamorphopsia in patients with ERM.
Insights
A new metamorphopsia chart (M-CHARTS) effectively quantifies visual distortion in patients with idiopathic epiretinal membranes (ERMs). The chart
Area of Science:
- Ophthalmology
- Visual Science
Background:
- Idiopathic epiretinal membranes (ERMs) can cause significant visual distortion (metamorphopsia).
- Accurate quantification of metamorphopsia is crucial for assessing ERM severity and treatment outcomes.
Purpose of the Study:
- To evaluate the efficacy of a novel metamorphopsia chart (M-CHARTS) in quantifying visual distortion in patients with ERMs.
- To correlate M-CHARTS scores with the severity of ERMs as assessed by scanning laser ophthalmoscopy (SLO).
Main Methods:
- Developed M-CHARTS with varying dot intervals (0.2 to 2.0 degrees visual angle).
- Measured the minimum visual angle required to resolve metamorphopsia in 51 patients with ERM.
- Compared M-CHARTS scores with ERM staging determined by SLO imaging.
Main Results:
- Metamorphopsia scores increased with ERM severity, as classified by SLO.
- Horizontal M-CHARTS scores were higher than vertical scores in advanced ERM stages.
- A clear correlation was observed between ERM proliferation and metamorphopsia severity.
Conclusions:
- M-CHARTS offer a simple and effective tool for assessing metamorphopsia in ERM patients.
- The chart aids in objectively measuring visual distortion caused by epiretinal membranes.