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Bulgarian Review of Ophthalmology

M-CHARTS method for quantitative assessment of metamorphopsia in patients with ERM

Gergana Milanova

Abstract

Introduction:

The idiopathic epiretinal membrane (iERM) is a fibrocellular membrane proliferating on the inner surface of the retina in the area of the macula. The contraction of this membrane causes a disorder in vision, which results from the occurring fibrous remodeling. Metamorphopsia is the main symptom and cause of impaired quality of vision in patients with iERM. The Amsler grid is commonly used to detect metamorphopsia, but it is impossible to quantify its severity. To overcome this limitation, Matsumoto et al. developed charts, called M-CHARTS, to quantify the severity of metamorphopsia.

Aim:

The aim of the present study is to make a quantitative assessment of metamorphopsia in a group of patients diagnosed with idiopathic epiretinal membrane using M-CHARTS and to establish the existence of a relationship between the severity of metamorphopsia and visual acuity.

Materials and Methods :

 The study was conducted at Dr. Ivanovi Eye Hospital in Burgas and was previously approved by the Commission for Scientific Research Ethics of the Medical University of Varna.The study included 20 patients diagnosed with epiretinal membrane. Each patient underwent a complete ophthalmological examination, and metamorphopsia was assessed with Amsler’s grid and M-CHARTS.

Results:

Using M-CHARTS, the minimum visual angle of the dotted lines required for disappearance of metamorphopsia was measured in 20 eyes of 20 patients with iERM, thereby quantifying the degree of metamorphopsia. Using Spearman’s correlation coefficient to assess the relationship between metamorphopsia and visual acuity, it was found that there was no significant relationship between metamorphopsia scores and visual acuity.

Conclusion:

 The use of M-CHARTS is a simple and useful method for quantitative tracking of metamorphopsia in patients with ERM, which can be used as a tool necessary in the search and finding of the optimal treatment strategy and control of functional visual outcomes.

                                        


Keywords

idiopathic epiretinal membrane (iERM), metamorphopsia, M-CHARTS

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DOI: http://dx.doi.org/10.14748/bro.v67i1.8743

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About The Author

Gergana Milanova
SOBAL Burgas / MU Varna
Bulgaria

Department of Ophthalmology and Visual Sciences, Faculty of Medicine;

Specialized Eye Hospital, Burgas

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