Table 5. Epidemiological studies on the prevalence of refractive anisometropia among children.

Study (year)	Number of participant and area	Study design	Ethnicity	Age	Prevalence of anisometropia
Huynh et al. [11] (2006)	n = 1765; Australia	Population-based	European white (63.6%), East Asian (17.1%)	6 years	1.6%
Tong et al. [12] (2006)	n = 1979; Singapore	Population-based	East Asian and South Asian	7 to 9 years	3.6%
Giordano et al. [13] (2009)	n = 2298; USA	Population-based	White and African-American	6 to 72 months	5.0% (white), 4.3% (African-American)
Borchert et al. [14] (2010)	n = 6024; USA	Population-based	Hispanic and African-American	6 to 72 months	4.0% (Hispanics), 4.2% (African-American)
Yekta et al. [15] (2010)	n = 1872; Iran	Population-based	Iranian	7 to 15 years	2.6%
Deng et al. [16] (2012)	n = 1120; USA	Longitudinal	White	6 months, 5 years and 12 to 15 years	1.96% at 6 months, 1.27% at 5 years, 5.7% at 12 to 15 years
Afsari et al. [17] (2013)	n = 2090; Australia	Population-based	European-Caucasian (46.9%), Asian (33.4%), Others (19.6%)	6 to 72 months	2.7%
O’Donoghue et al. [18] (2013)	n = 1053; Northern Ireland	Population-based	European-Caucasian	6–7 and 12–13 years	8.5% at 6–7 years, 9.4% at 12–13 years
Hu et al. [19] (2016)	n = 6025; China	School-based	East Asian	4 to 18 years	7.0%
The present study	n = 23,114; Taiwan	Population-based	East Asian	8 years	5.3%