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. Author manuscript; available in PMC: 2016 Aug 1.
Published in final edited form as: J AAPOS. 2015 Jul 31;19(4):352–7.e1. doi: 10.1016/j.jaapos.2015.05.004

Table 3.

Relative raw effects of J0 astigmatism (from cycloplegic refraction) and unsigned spherical aberration (z12u) on best-corrected visual acuity

Parameters for determining logMAR effect J0, D z12u
25th Percentile 0.059 D 0.020 micron
75th Percentile 0.750 D 0.064 micron
75th–25th magnitude 0.691 D 0.044 micron
logMAR coefficient 0.152 logMAR/D 0.583 logMAR/μ
logMAR effecta 0.105 logMAR 0.026 logMAR

D, diopters; logMAR, logarithm of the minimum angle of resolution.

a

Effect size calculated on difference between 25th and 75th percentiles of observations. The increase in logMAR score represents worsening, 0.1 logMAR units represents 1 line, 5 letters per line. Comparative effect: J0 astigmatism is 4.0 times as potent as z12u in the magnitude of its effect in decreasing best-corrected visual acuity in this population.