Visual Acuity and Refractive Errors

Distribution of the corrected visual acuity of patients with both types of CSNB is shown in Fig. 2.56. The visual acuities ranged from 0.1 to 1.0 (mean 0.4-0.5). The visual acuities of the patients with complete CSNB do not differ significantly from those with incomplete CSNB [10].

The distribution of the refractive errors in the two groups is shown in Fig. 2.57. Many patients with complete CSNB have moderate to high myopic refractive errors, whereas those with incomplete CSNB have mild myopic to hyperopic refractive errors. The difference in the mean refractive errors is significant [10].

Erg Complete Incomplete Csnb

Fig. 2.56. Distribution of visual acuity of complete and incomplete CSNB. (From Miyake [10])

Complete CSNB

+ 15

0

+5

Myopic . '

•CI

* •

Incomplete CSNB

Hyperopic oyj o

Myopic s

Fig. 2.56. Distribution of visual acuity of complete and incomplete CSNB. (From Miyake [10])

Fig. 2.57. Distribution of refractive errors of complete and incomplete CSNB. (From Miyake [10])

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