Visual Field Defects in Low to High Myopia

Myopia is a global issue and significantly contributed to vision loss and ocular complications affected more than 1 billion people worldwide. This study aimed to evaluate visual field defects in association with the level of myopia degree. A retrospective study was conducted at MSU Eye Centre where the data of OCULUS Twinfield® 2 test from May 2015 to April 2018 were analysed. The global indices (mean deviation, MD, pattern standard deviation, PSD and probability plots) and spherical equivalent were used as parameters of this study. A total of 90 records comprising of 44.4% (40) of males and 55.6% (50) females with the mean age of 29.16 (SD: 10.27) years old and the spherical equivalent was -2.92 (SD:2.94) of the emmetrope, moderate and high myopia. The mean MD index was -1.71 dB (SD 3.95 dB) and PSD was 1.81 dB (SD:1.82 dB) respectively. There is a significant difference between emmetrope, moderate and high myope of MD (X2(2)=8.892, p=0.012) and PSD (X2(2) =42.057, p<0.01). The probability plot shows a significant difference for all quadrant (p<0.01) in P>2%. However, there was only a significant difference noted in temporal (X2(2)=9.47, p<0.01), nasal (X2(2)=11.33, p<0.01) and inferior (X2(2)=11.89, p<0.01) for P<1% probability plots. Pearson correlation test revealed a weak correlation for MD (rs= 0.253) and better correlation for PSD (rs= -0.703) in respective to spherical equivalent. Conclusions: There are localised visual field defect found in a higher degree of myopia, and therefore the visual field test is recommended in moderate to high myopic individuals for monitoring the myopia progression