Table 4: Myopia had a significantly greater prevalence in Class II patients [³⁵].

Type of visual defect	Class I (n=119)	Class II (n=62)	Class II Division 2 (n=15)	Class III (n=20)	Results of χ2 test
	n - %	n - %	n - %	n- %	P value
Myopic	21 - 9.7%	42 - 19.4%	6 - 2.7%	3 - 1.3%	p<0.0001
Non-myopic	98 - 45.3%	20 - 9.25%	9 - 4.1%	17 - 7.8%	p<0.005