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. Author manuscript; available in PMC: 2009 Apr 1.
Published in final edited form as: J AAPOS. 2007 Dec 26;12(2):145–149. doi: 10.1016/j.jaapos.2007.08.014

Table 1.

Mean and 95% tolerance interval for visual acuity and interocular difference categorized by age group. Unless otherwise stated, visual acuity values are presented in logMAR units. Note that the data of 8- to 10-year-old children have been combined due to limited enrollment for this age group.

Visual acuity
Interocular acuity difference (IOD)
Age group (years) Number of participants Number of eyes Mean visual acuity Mean visual acuity (Snellen) 95% tolerance interval Lower limit Lower limit (Snellen) Number of participants Mean IOD 95% tolerance interval
3 37 68* 0.08 20/24 ±0.21 0.29 20/39 31 0.03 ±0.10
4 182 360* 0.08 20/24 ±0.17 0.25 20/36 178 0.05 ±0.12
5 47 93* 0.03 20/21 ±0.19 0.22 20/33 46 0.04 ±0.10
6 34 68 −0.03 20/19 ±0.18 0.15 20/28 34 0.02 ±0.07
7 35 70 −0.02 20/19 ±0.10 0.08 20/24 35 0.04 ±0.14
8–10 49 98 −0.06 20/17 ±0.12 0.06 20/23 49 0.02 ±0.10
Adults 23 46 −0.04 20/18 ±0.17 0.13 20/26 23 0.03 ±0.09
Total 407 803 396
*

Not all participants could complete testing of both eyes at 3, 4, and 5 years of age.