ON THE NEED TO STUDY THE VALUE OF FUSIONAL RESERVES
Assessing the range of fusional vergence constitutes one of the most important diagnostic tools to provide information about the ability to maintain binocular vision. The eyes' tendency to deviate from bifoveal fixation (phoria) is controlled by fusional vergence; motor fusion is a foundation for eye alignment combined with sensory fusion and stereopsis. If there's a heterotropia, the grade of misalignment exceeds the capabilities of fusional vergence. People with the intermittent deviations are likely to be near their motor fusion threshold and have the most to gain by vergence amplitude testing. The purpose of this study was to analyze the values of fusional reserves in the sample and compare them with the normal values of fusional reserves according to Avetisov. 30 patients aged from 22 to 24 years old were examined by van Graefe method. In the study, the minimum prism strength at which binocular doubling appeared was estimated. As a result, it was found a decrease in fusional reserves in 5 people. In 6 patients, the value of fusional reserves at the lower limit of the norm. Thus, it is necessary to study fusional reserves in patients with the absence of uncorrected ametropia, presenting asthenopic complaints.