Abstract
Purpose
To describe visual performance in high myopia.
Methods
In this cross-sectional study, 148 emmetropes [spherical equivalent (SE) − 0.50 to + 1.00 D] and 564 high myopes [SE ≤ − 6.00 D] were categorised into three groups (Group 1: SE − 6.00 to > − 8.00 D; Group 2: SE − 8.00 to > − 10.00 D; and Group 3: SE ≤ − 10.00 D). Multivariate regression analyses adjusting for age and ethnicity examined the relationship between corrected distance visual acuity (CDVA) [photopic, mesopic and super vision test-night vision goggles (SVT-NVG)] and contrast sensitivity (CS)] (mesopic and SVT-NVG) with SE and axial length (AL).
Results
Mean age of subjects was 21.07 ± 1.17 years, and majority were Chinese (91.9%). Mean SE was 0.10 ± 0.23 D (emmetropes) and − 8.76 ± 2.04 D (high myopes), p < 0.001. Higher degrees of myopia were associated with reduced CDVA and CS, and increased AL (all p < 0.001). Among high myopes, Group 1 had the highest proportion of subjects with good CDVA (photopic ≤ 0.00 LogMAR, mesopic ≤ 0.00 LogMAR and NVG ≤ 0.10 LogMAR) and CS (mesopic ≥ 0.75 LogCS and NVG ≥ 0.35 LogCS) compared with Groups 2 and 3 (all p < 0.001). Among high myopes with good VA (photopic ≤ 0.00 LogMAR, mesopic ≤ 0.00 LogMAR and NVG ≤ 0.10 LogMAR), Group 1 also had the highest proportion of subjects who achieved mesopic ≥ 0.75 LogCS and NVG ≥ 0.35 LogCS (both p < 0.001). Multivariate analyses demonstrated that reduced VA and CS were associated with decreased SE and increased AL (all p < 0.001).
Conclusions
High myopia is associated with reduced VA and reduced CS.
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Funding
The authors did not receive any funding specifically for this study. A/Prof Tan receives research funding from the National Medical Research Council Transition Award (Code: NMRC/TA/0039/2015). A/Prof Tan also receives conference support from Bayer (South East Asia) Pte. Ltd., Heidelberg Engineering (Heidelberg, Germany), and Novartis (Singapore). The remaining authors do not receive funding.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (SingHealth Centralised Institutional Review Board) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Ang, B.C.H., Cheong, K.X., Tan, M.M.H. et al. Correlation of myopia severity with visual performance. Int Ophthalmol 40, 2201–2211 (2020). https://doi.org/10.1007/s10792-020-01403-7
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DOI: https://doi.org/10.1007/s10792-020-01403-7