VISUAL ACUITY RESEARCH USING OPTATIPES WITH DIFFERENT PROFILE OF OPTICAL DENSITY

One of the main diagnostic methods in ophthalmology is visual aquity examination. It is one of the most important examinations for revealing of aggravants, malingerers and dissimulaters for expert maters. Survey data of visual acuity research is comparing in 2 groups of tables (tables for visual acuity research: Golovin-Sivtsev’s table, Landolt’s rings; tables for assessment the distance of optotypes’ recognition). The disappearing distance of optotypes’ recognition (shapes with a complex contour profile) was measured. They have a unique particular - the closeness of recognition and detection thresholds, what increases the accuracy of visual acuity accuracy measurements and researchers’ attention to them. As a result of the exploration, we brought to light that the optical profile of the optotype has influence on the distance of it’s recognition, and also depends on the complexity of the configuration. It is easier to detect optotypes in the form of a vanishing Landolt ring for probationers, as opposed to"bar worlds". The results’ coincidence to observing the size of optotypes depends on the complexity of the configuration and it is due to internal irradiation ("crowding effect" - a phenomenon of visual perception). The provided data gives possibility to understand that the degree of correlation may differ due to different ranges presented in the article. The exploration and modification of tables allow us to improve the methodology for visual acuity studying and increasing the accuracy of the result, without departing from modern standards. Modified optotypes viden the possibilities of accurate determination of visual acuity in cases of simulation of aggravatio and dissimulatio.

optotypes, visual acuity, Golovin-Sivtsev's table, bar-world table, Landolt's rings table