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Shin-Ichiro Ito, Noriko Miyamoto, Kazuhiro Ishida, Yasuo Kurimoto; The Significance of Preoperative External Limiting Membrane Status for Visual Acuity after Treatment of Diabetic Macular Edema by Pars Plana Vitrectomy. Invest. Ophthalmol. Vis. Sci. 2011;52(14):991.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the association between preoperative photoreceptor layer status and visual acuity (VA) after performing pars plana vitrectomy (PPV) in diabetic macular edema (DME).
We retrospectively reviewed the spectral-domain optical coherence tomography (SD-OCT) images of 28 eyes from 22 cases with DME who were treated with PPV and evaluated the correlation of preoperative factors such as the status of external limiting membrane (ELM) and inner segment/outer segment (IS/OS), foveal macular thickness, and the presence or absence of serous retinal detachment, hard exudate and vitreous adhesion with the VA at one and three months after PPV. The status of ELM and IS/OS was classified into 3 categories (absent, disrupted, and complete).
There was a strong correlation between preoperative ELM status and the VA at one (r=0.515, P=0.005) and three months (r=0.553, P=0.002) after PPV, and also between preoperative IS/OS status and the VA at one (r=0.425, P=0.024) and three months (r=0.534, P=0.03) after PPV. The ELM status had stronger correlation with the VA than the IS/OS status. However, there was no correlation between the other factors and the postoperative VA.
These results indicated that preoperative ELM status may be more useful than preoperative IS/OS status to predict VA after PPV in DME.
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