“…Similarly, while the overall population prevalence of strabismus outside the United States ranges from Ͻ1 to 10%, international researchers found the prevalence of strabismus among individuals with ID to range from 4 to 45% (Table 1) [Lyle et al, 1972;Bankes, 1974;Woodruff, 1977;Woodruff et al, 1980;Levy, 1984;Jacobson, 1988;Aitchison et al, 1990;Hestnes et al, 1991;McCulloch et al, 1996;Buch et al, 2001;van Splunder et al, 2003avan Splunder et al, , 2003bvan Splunder et al, , 2004Woodhouse et al, 2003]. The prevalence of cataracts (opacity of the lens of the eye, the capsule, or both) and keratoconus (swelling and scarring of the cornea) among individuals with ID also has been reported to be much higher than that in the general population (Table 1) [Lawson and Schoofs, 1971;Bankes, 1974;Markovits, 1975;Woodruff, 1977;Jaeger, 1980;NCHS, 1983;Levy, 1984;Kennedy et al, 1986;Day, 1987;Jacobson, 1988;Aitchison et al, 1990;Hestnes et al, 1991;Sacks et al, 1991;Evenhuis, 1995;Maino et al, 1996;McCulloch et al, 1996;Warburg, 2001b;Friedman et al, 2002;Congdon et al, 2003;Foran et al, 2003;Kerr et al, 2003;…”