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Clinical study compares clear vision zones and zero-associated phoria, indicating no age or sex influence.
Normative data comparing the zone of zero‐associated phoria (ZZAP) with the zone of clear single binocular vision (ZCSBV) are presented based on a clinical study of 156 asymptomatic patients. No statistically significant relations were found between zone difference and patient age, sex, and amount of near lens addition in the case of presbyopes.
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GODIO et al. (1981) studied this question.
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