Visual Performance of Highly Myopic Young Male Military Conscripts of Singapore

Visual Performance of Highly Myopic Young Male Military Conscripts of Singapore M H M Tan, H A Yang, L K F Tey
DSO National Laboratories, Singapore Contact: tmeihui@dso.org.sg
Most studies postulated the effects of visual degradation with increasing severity of myopia and axial elongation as the result of increased optical aberrations, reduced retinal sampling due to retinal stretching and/or spectacle minification resulting from myopia correction. The objective of this study is to evaluate the visual performance of highly myopic conscripts (spherical equivalent (SE) <=-6.00D) using high-contrast logMAR letters charts and super vision test-night vision goggle filter (SVT-NVG) under mesopic and simulated NVG conditions, and correlate their visual performance with refraction and axial length (AL). It was found that monocular visual acuity (VA) and contrast sensitivity (CS) deteriorated with increased myopia and AL (p<0.05 for all visual tests). The differences between the highly myopic subgroups and the controls were more distinct with SVT-NVG under mesopic and NVG conditions. In multivariate analysis with age and ethnicity adjustment, mesopic VA was negatively associated with SE (B=-0.022, 95%CI [–0.025, -0.019], standardised ß=-0.886, P<0.01) and AL (B=-0.019, 95%CI [-0.026, -0.012], standardised ß=-0.345, P<0.01); CS was positively associated with SE (B=0.045, 95%CI [0.035, 0.055], standardised ß=0.689, P<0.01) and AL (B=0.039, 95%CI [0.017, 0.060], standardised ß=0.267, P<0.01). • [Strang et al, 1998, Vision Research, 38:1713-1721], • [Chui et al, 2005, Vision Research, 45:593-605].

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