A comparative study of OCT findings in low and high myopia

Abstract

Aim This study aimed to compare macular findings between low and high myopia. Patients and methods In all, 60 myopic eyes were included in this study. They were divided according to refraction into low myopia of less than or equal −6 SD and high myopia of more than −6 SD. All patients were subjected to automated refraction, correction of vision, A-scan by Isa intra Ocular length (IOL) master for axial length, and optical coherence tomography (OCT) scan for macular mapping. Results The mean central macular thickness (CMT) of low myopic cases was 255.5±17.13, with all low myopic cases showing no complication by OCT while the mean CMT of high myopia was 262.10±67.51 with some complications. Regarding choroidal neovascularization (CNV), it was statistically significantly higher in the high myopic group when compared with the low myopic group, while macular hole showed no significance. Thinning of RPE and myopic contour showed high significant statistical difference to high myopic group. Discussion The mean CMT of low myopic cases was slightly thinner than in high myopic cases but with no statistical significance. Myopic CNV is more common with high myopia and may be related to sex. Thinning of RPE and myopic contour are mainly found in high myopia. Conclusions In our study, there was no significant correlation between CMT and axial length. Regarding CNV, it was statistically significantly higher in the high myopic group when compared with the low myopic group, while macular hole showed no significance. Thinning of RPE and myopic contour are mainly found in high myopia.