The heterophoria and fusional amplitude were measured on 100 normal Korean peoples, aged from 5 to 66 years.
1. The normal value of the horizontal and vertical phoria were measured by phorometer at 6m distance.
They were revealed that the frequency of the heterophoria were 95% of horizontal phoria, 26% of vertical phoria and 5% of orthophoria. And there were no statistical correlation between age,
sex and heterophoria.
2. The normal value of the convergence, divergence, vertical and cyclovergence fusioanl amplitude were measured with major amblyoscope.
And the correlation between horizontal phoria and horizontal fusional amplitude, age and fusional amplitude were also studied.. The results were as follows.
The normal value of convergence fusional amplitude revealed significantly higher value than other datas which measured by rotary prism or other methods, but divergence and vertical fusional amplitude were almost same value than others.
The difference seemed due to using interesting picture slide in my experience which stimulate accommodative factor.
The correlation between horizontal phoria and horizontal fusional amplitude revealed that smaller convergence amplitude in exophoria, and larger in esophoria, but no significant relationship between divergence amplitude and horizontal phoria were noted.
Also there were no significant correlation between age and fusional amplitude.
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