Visual Function in Patients with Diabetic Retinopathy After Pan Retinal Photocoagulation
Chen, Xing   (University of Michigan-Ann Arbor)
Mentor: Gardner, Thomas
Diabetic retinopathy (DR) is a leading cause of visual impairment in the world. Proliferative diabetic retinopathy (PDR) is an advanced form of DR. It is characterized by formation of new, fragile blood vessels in the retina that may leak blood and obscure vision. Currently, PDR is often treated with pan retinal photocoagulation (PRP) to prevent risk of severe vision loss. The purpose of this study is to determine changes in visual function in patients who had PDR and PRP. We had 22 participants who underwent vision testing that examines both central and peripheral visual functions. They were divided into 2 groups: those with best corrected visual acuity better than or equal to 20/25 (Good VA) or worse (Poor VA). Outcome measures from quick Contrast Sensitivity Function, Minnesota reading test, Frequency Doubling Technology 24-2 program, Humphrey Field Analyzer 10-2 and 60-4 program were significantly better in the Good VA group than in the Poor VA group. However, there are some participants who had good visual acuity but poor performance in other visual function testing and report lower quality of life. This study demonstrates that good VA after PRP is generally associated with better central and peripheral visual functions compared to those with poor VA. Further study is needed to elucidate the mechanism of vision loss in patient who had PDR and PRP with the goal of restoring lost vision.