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Correlating myopia severity with visual performance in a young Asian male population
Author(s) -
Ang B.C.H.,
Tan M.M.H.,
Cheong K.X.,
Lim E.W.L.,
Yang A.H.,
Tey F.L.K.,
Tan C.S.H.,
Tan M.C.L.
Publication year - 2016
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2016.0440
Subject(s) - mesopic vision , photopic vision , emmetropia , ophthalmology , medicine , optometry , contrast (vision) , population , visual acuity , refractive error , retinal , optics , environmental health , physics
Purpose To examine the visual performance in a young Asian male population with severe myopia. Methods A cross‐sectional study of right eyes of 564 severe myopes [Spherical Equivalent (SE) ≤−6.00 D] and 148 emmetropes (SE −0.50 to +1.00 D). The severe myopes were categorised into three groups (Group 1: SE −6.00 to >−8.00D; Group 2: SE −8.00 to >−10.00D; and Group 3: SE ≤−10.00D). Multivariate regression analyses adjusting for age and ethnicity were performed to examine the relationship between Corrected Distance Visual Acuity (CDVA) [photopic, mesopic and Night Vision Goggles (NVG)] and Contrast Sensitivity (CS) (mesopic and NVG) with SE and Axial Length (AL). Results The mean age of subjects was 21.07 ± 1.17 years and majority were Chinese (91.9%). The mean SE was 0.10 ± 0.23D for emmetropes and −8.76 ± 2.04D for severe myopes (p < 0.001). Higher degrees of myopia were associated with reduced CDVA and CS and increased AL (all p < 0.001 among groups). Among the severe myopes, Group 1 had the highest proportion of subjects with good CDVA (photopic ≥6/6, mesopic ≥6/6, and NVG ≥6/7.5 LogMAR) and CS (mesopic ≥0.75 and NVG ≥0.35 LogCS) compared to Groups 2 and 3 (all p < 0.001). Among severe myopes with good VA (photopic ≥6/6, mesopic ≥6/6, or NVG ≥ 6/7.5 LogMAR), Group 1 also had the highest proportion of subjects who achieved mesopic CS of ≥0.75 and NVG CS ≥0.35 LogCS (both p < 0.001). Multivariate analyses also demonstrated that reduced VA and CS were significantly associated with decreased SE and increased AL (all p < 0.001). Conclusions Higher degrees of myopia are associated with reduced VA and reduced CS.