Russian Military Medical Academy ReportsRussian Military Medical Academy Reports2713-23152713-2323Eco-Vector4342510.17816/rmmar43425Research ArticleVISUAL ACUITY RESEARCH USING OPTATIPES WITH DIFFERENT PROFILE OF OPTICAL DENSITYZhilchukD. I-DudalyanD. A-S.M. Kirov Military Medical Academy of the Ministry of Defense13122020391S19920328082020Copyright © 2020, Zhilchuk D.I., Dudalyan D.A.2020One 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.optotypesvisual acuityGolovin-Sivtsev's tablebar-world tableLandolt's rings tableоптотипыострота зрениятаблица «Головина-Сивцева»таблица «штрих-мир»таблица «кольца Ландольта»[1. Бойко Э.В. Механизмы распознавания контурных «исчезающих» оптотипов / Бойко Э.В., Шелепин Ю.Е., Коскин С.А., Соболев А.Ф. // Российский физиологический журнал. - 2005. - N 9. - С.1080-1090.][2. Шелепин Ю.Е. /Объективное измерение остроты зрения человека методом зрительных вызванных потенциалов / Шелепин Ю.Е., Ха-раузов А.К., Сельченкова Т.В. // Российский физиологический журнал. - 2005. - №8. - С.956-969.][3. Красильников Н.Н. /Функциональная модель зрения: научное издание / Н.Н. Красильников, Ю.Е. Шелепин // Оптич. журн. - 1997. - Т.64, №2. - С.72-82.][4. Дудкин К.Н. Цифровая обработка изображений в физиологических исследованиях / К.Н. Дудкин // Рос. физиол. журнал. - 1998. - Т.84, - №3.][5. Бойко Э.В. / Электрофизиологические и психофизические исследования влияния длительности предъявления текстур на пороги распознавания / Бойко Э.В., Шелепин Ю.Е., Коскин С.А., Соболев А.Ф. // Российский физиологический журнал. - 2011. - №3. - С.316-329.][6. Anderson R.S. Improving ophthalmic diagnosis in the clinic using the Moorfields Acuity Chart / R.S. Anderson // Expert Review of Ophthal-mology. - 2017. - №1. - С.433-435.][7. Anderson R. More sensitive visual acuity test for age-related macular degeneration / R. Anderson, N. Shah // Originally Published (https://www.eyenews.uk.com/features/ophthalmology/post/more-sensitive-visual-acuity-test-for-age-related-macular-degeneration).][8. Shah N. Vanishing Optotype acuity: repeatability and effect of the number of alternatives/ N. Shah, S.C. Dakin, T. Redmond, R.S. Anderson // Ophthalmic & Physiological Optics. - 2011. - №31. - С.17-22.][9. Shah N. / Современные методы измерения остроты зрения / N. Shah, S.C. Dakin, R.S. Anderson // Современная оптометрия. - 2016. - №7. - С.33-40.]