 B. Accommodative and Vergence Insufficiency. Visual discomfort symptoms also have been association with convergence and accommodative insufficiency in children Evans et al, 1995; Evans et al, 1996; Borsting et al., 1999; 2003, 2004. Convergence Insufficiency CI, or difficulty maintaining binocular fusion of an approaching object, is defined by one or more clinical signs that include: exophoria at near that is greater than at distance, decreased positive fusional vergence, and a near point of convergence that has receded. The prevalence of CI in school-aged children varies from about 4-8 depending on the presence of two or three CI signs Rouse et al., 1997; Rouse et al., 1999. Accommodative insufficiency AI, or difficulty maintaining focus on an approaching target, is often associated with CI. Borsting et al. 2003 found that 40 of school-aged children with AI also had CI, and almost 80 of those with all three signs of CI had AI. Borsting et al 2003 found children with normal binocular vision had an average symptom score of 3.8, whereas the three-sign CI and AI children reported significantly more symptoms, averaging 6.7 and 6.4, respectively. 