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  • Title: Correlation between metamorphopsia and epiretinal membrane optical coherence tomography findings.
    Author: Watanabe A, Arimoto S, Nishi O.
    Journal: Ophthalmology; 2009 Sep; 116(9):1788-93. PubMed ID: 19643494.
    Abstract:
    PURPOSE: To examine the retinal morphologic features of metamorphopsia caused by epiretinal membrane (ERM) and to determine whether spectral-domain optical coherence tomography (SD-OCT) correlated with metamorphopsia. DESIGN: Retrospective case series. PARTICIPANTS: This study included 19 eyes of 19 patients with ERM diagnosed by clinical ophthalmic findings and SD-OCT. METHODS: The 19 eyes were classified into 3 groups based on Amsler chart results: no metamorphopsia (n = 4), local metamorphopsia (n = 8), and broad metamorphopsia (n = 7). The thickness of the 3 inner retinal layers: inner nuclear layer (INL), outer plexiform layer (OPL), and outer nuclear layer (ONL), on 5 horizontal SD-OCT cross-sections (1 line through the fovea, 2 regularly spaced lines superior to the fovea, and 2 regularly spaced lines inferior to the fovea) were measured using the electronic calipers of the SD-OCT system. MAIN OUTCOME MEASURES: Correlation between INL, OPL, and ONL thickness with metamorphopsia and visual acuity. RESULTS: Metamorphopsia was detected in the same position as edematous areas of the INL with a thickness >50 mum. The maximum INL thickness was relatively significantly different between the subjects with no metamorphopsia and those with local or broad metamorphopsia (vs local, P = 0.06; vs broad, P = 0.04). Visual acuity significantly correlated with both maximum INL thickness (A = -0.681; P = 0.001) and maximum ONL thickness (A = -0.708; P<0.001) in metamorphopsia. CONCLUSIONS: Metamorphopsia induced by ERM may be related to the edematous areas of the INL detected with SD-OCT. The classification of ERM based on INL thickness is a potentially useful indication for surgery. FINANCIAL DISCLOSURE(S): The authors have no proprietary or commercial interest in any of the materials discussed in this article.
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