Table 1.

The number of responders falling into each refractive error category.

Refraction	Definition	Number n	Percentage %
			(total n = 81)
Emmetropia	−0.75 D to +2.75 D	20	24.7
Hypermetropia only	> +2.75 D	13	16.0
Myopia only	>-0.75 D	1	1.2
Simple astigmatism	One meridian ametropic and the other meridian emmetropic	20	24.7
Hypermetropic Astigmatism	Both meridians hypermetropic	22	27.2
Myopic Astigmatism	Both meridians myopic	5	6.2

The refraction is for the least ametropic or fixing eye.