Sood, S, Subina Narang, S Kocchhar, S Sarda, S Aggarwal, and SK Arya. 2013. “Correlation of Progression of Diabetic Retinopathy With the Alterations in Retrobulbar Circulation”. Nepalese Journal of Ophthalmology 5 (2):147-53. https://doi.org/10.3126/nepjoph.v5i2.8705.