Journal of Ophthalmology / 2015 / Article / Tab 2 / Review Article
A Novel Review of the Evidence Linking Myopia and High Intelligence Table 2 Summary of study results linking myopia and high intelligence.
Study Country Number of subjects Age (years) Range of myopia Intelligence test performed IQ Test/school results Significance level∗ Young 1955 [14 ] USA 633 6–17 Not specified Stanford-Binet Average N/A < 0.001 CC∗∗ = −0.19Nadell and Hirsch 1958 [15 ] USA 414 14–18 Not specified CTMM Higher N/A > 0.1Hirsch 1959 [27 ] USA 554 6–17 Not specified Stanford-Binet CTMM Higher N/A < 0.001Young 1963 [28 ] USA 251 5–17 Not specified Stanford-Binet CTMM Average Higher CC = −0.11/0.10 CC = −0.17/0.21 Grosvenor 1970 [29 ] New Zealand 707 11–13 ≥−1.00 D Otis Test Higher Higher > 0.05 (versus emmetropes) < 0.05 (versus hypertropes)Karlsson 1976 [30 ] USA 2527 17-18 Not specified Lorge-Thorndike IQ Test CTMM Higher Higher < 0.001
C. P. Benbow and R. M. Benbow 1984 [31 ] USA 416 13 Not specified Scholastic Aptitude Test Higher Higher < 0.05Rosner and Belkin 1987 [32 ] Israel 157 748 17–19 ≤6/7.5 VA Verbal Otis Test, Raven Matrix Test Higher Higher Strongly positive association Williams et al., 1988 [13 ] New Zealand 537 7–11 ≥−0.5 D WISC-R IQ Test Burt Word Reading Test Higher Higher < 0.05Teasdale et al., 1988 [33 ] Denmark 15 834 18 ≥−0.25 D to ≤−7.5 D Group IQ Scores Educational levels Higher Higher < 0.001Dolezalova and Mottlova 1995 [12 ] Czech Republic 225 14–18 Unknown School test scores Higher Higher Unknown Saw et al., 2004 [34 ] Singapore 1204 10–12 ≥−0.5 D Raven Matrix Test Higher N/A < 0.05Saw et al., 2006 [35 ] Singapore 994 7–9 ≥−0.5 D Raven Matrix Test Higher Higher < 0.05Dirani et al., 2010 [36 ] Singapore 1143 9-10 ≥−0.5 D Raven Matrix Test Average Average > 0.38 (9-year-olds) > 0.27 (10-year-olds)Akrami et al., 2012 [37 ] Iran 137 10–14 ≥−0.5 D Unspecified school tests Average N/A = 0.465
score < 0.05 denotes statistically significant result.∗∗ CC: correlation coefficient. Data unavailable in English language at time of the literature review.