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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Ophthalmology Reports</journal-id><journal-title-group><journal-title xml:lang="en">Ophthalmology Reports</journal-title><trans-title-group xml:lang="ru"><trans-title>Офтальмологические ведомости</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1998-7102</issn><issn publication-format="electronic">2412-5423</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">530658</article-id><article-id pub-id-type="doi">10.17816/OV530658</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Original study articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Оригинальные исследования</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Analysis of the effect of keratotopographic parameters on tonometric intraocular pressure</article-title><trans-title-group xml:lang="ru"><trans-title>Анализ влияния кератотопографических показателей на тонометрическое внутриглазное давление</trans-title></trans-title-group><trans-title-group xml:lang="zh"><trans-title/></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8216-5025</contrib-id><contrib-id contrib-id-type="spin">6511-9260</contrib-id><name-alternatives><name xml:lang="en"><surname>Ahmetov</surname><given-names>Nail R.</given-names></name><name xml:lang="ru"><surname>Ахметов</surname><given-names>Наиль Равилевич</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>ahmetovn17@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0863-7762</contrib-id><name-alternatives><name xml:lang="en"><surname>Samoylov</surname><given-names>Aleksandr N.</given-names></name><name xml:lang="ru"><surname>Самойлов</surname><given-names>Александр Николаевич</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Medicine), Professor</p></bio><bio xml:lang="ru"><p>д-р мед. наук, профессор</p></bio><email>samoilovan16@gmail.com</email><xref ref-type="aff" rid="aff4"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0549-783X</contrib-id><contrib-id contrib-id-type="spin">7840-8256</contrib-id><name-alternatives><name xml:lang="en"><surname>Usov</surname><given-names>Viktor A.</given-names></name><name xml:lang="ru"><surname>Усов</surname><given-names>Виктор Алексеевич</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Medicine)</p></bio><bio xml:lang="ru"><p>канд. мед. наук</p></bio><email>vik-usov@rambler.ru</email><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kazan State Medical University</institution></aff><aff><institution xml:lang="ru">Казанский государственный медицинский университет</institution></aff><aff><institution xml:lang="zh"></institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">E.V. Adamyuk Republican Clinical Ophthalmological Hospital of the Ministry of Health of the Republic of Tatarstan</institution></aff><aff><institution xml:lang="ru">Республиканская клиническая офтальмологическая больница Министерства здравоохранения Республики Татарстан им. проф. Е.В. Адамюка</institution></aff><aff><institution xml:lang="zh"></institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">E.V. Adamyuk Republican Clinical Ophthalmological Hospital of the Ministry of Health of the Republic of Tatarstan</institution></aff><aff><institution xml:lang="ru">Республиканская клиническая офтальмологическая больница Министерства здравоохранения Республики Татарстан им. проф. Е.В. Адамюка</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Kazan State Medical University</institution></aff><aff><institution xml:lang="ru">Казанский государственный медицинский университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-01-12" publication-format="electronic"><day>12</day><month>01</month><year>2024</year></pub-date><volume>16</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><issue-title xml:lang="zh"/><fpage>15</fpage><lpage>22</lpage><history><date date-type="received" iso-8601-date="2023-07-06"><day>06</day><month>07</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-09-05"><day>05</day><month>09</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Эко-Вектор</copyright-statement><copyright-statement xml:lang="zh">Copyright ©; 2024,</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2027-01-12"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://eco-vector.com/for_authors.php#07</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/ov/article/view/530658">https://journals.eco-vector.com/ov/article/view/530658</self-uri><abstract xml:lang="en"><p><bold>BACKGROUND:</bold><italic> </italic>Applanation tonometers remain popular in most countries of the world; in Russia, the Maklakov tonometer is one of them. When using a Maklakov tonometer, intraocular pressure values are obtained indirectly through the cornea, which has individual characteristics, which certainly introduces its own errors into the accuracy of the measurement results.</p> <p><bold>AIM:</bold><italic> </italic>The aim of this study was to investigate the influence of keratotopographic parameters on tonometric intraocular pressure.</p> <p><bold>MATERIALS AND METHODS:</bold><italic> </italic>A study of 16 keratotopographic indices (using ALLEGRO Oculyzer Wavelight Oculyzer II) and of tonometric intraocular pressure values obtained using Maklakov tonometer (NGm2-“OFT-P”) was carried out in 500 patients (1000 eyes). Among the study population there were patients with both emmetropic refraction — 8 eyes (0.8%), and patients with refractive errors 992 eyes (99.2%), among them: 978 eyes (97.8%) had myopic refraction 14 (1.4%) eyes had isolated refraction with myopic astigmatism. 889 eyes (88.9%) combined myopic refraction with myopic astigmatism.</p> <p><bold>RESULTS:</bold><italic> </italic>Based on the analysis of 16 keratotopographic parameters and tonometric intraocular pressure values, 500 patients (1000 eyes), the greatest influence of 13 studied parameters of the cornea was determined, such as: <italic>K</italic><sub>1</sub> (keratometry of flatter meridian); <italic>K</italic><sub>2</sub> (keratometry of steeper meridian); <italic>K</italic><sub>m</sub> (mean keratometry); <italic>R</italic><sub>f</sub> (radius of the flatter meridian); <italic>R</italic><sub>s</sub> (radius of the steeper meridian); <italic>R</italic><sub>m</sub> (mean radius of curvature); <italic>R</italic><sub>min</sub> (minimal radius of curvature); <italic>R</italic><sub>per</sub> (average radius of curvature between the 6 mm and 9 mm zone center); IVA (index of vertical asymmetry); ISV (index of surface variance); CKI (central keratoconus index); Thickness (thickness); IHD (index of height decentration) — on intraocular pressure values.</p> <p><bold>CONCLUSIONS:</bold> Based on the results obtained, we determined the effect of topographic parameters of the cornea on tonometric intraocular pressure, and created a formula for correcting intraocular pressure values based on the original formula we developed: <italic>P</italic><sub>t</sub> keratotopographic corrected = <italic>P</italic><sub>t</sub> + (±ISV<sub>p</sub>) + (±IVA<sub>p</sub>) + (±<italic>R</italic><sub>mp</sub>) + (±<italic>K</italic><sub>mp</sub>) + (±CKI<sub>p</sub>) + (±Thickness<sub>p</sub>), where <italic>P</italic><sub>t</sub> keratotopographic corrected is the corrected tonometric intraocular pressure and <italic>P</italic><sub>t</sub> is the tonometric intraocular pressure.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Актуальность</bold><italic>. </italic>В большинстве стран мира остаются популярными аппланационные тонометры, в России таковым является тонометр Маклакова. При использовании тонометра Маклакова получают значения внутриглазного давления опосредованно через роговицу, которая имеет индивидуальные особенности, что безусловно вносит свои погрешности в точность результатов измерения.</p> <p><bold>Цель</bold> — изучение влияния кератотопографических показателей на тонометрическое внутриглазное давление.</p> <p>Материалы и методы.<italic> </italic>Проведено исследование 16 кератотопографических показателей кератотопографа (ALLEGRO Oculyzer Wavelight Oculyzer II) и данных тонометрического внутриглазного давления с использованием тонометра Маклакова (НГм2-«ОФТ-П») у 500 пациентов (1000 глаз). Среди выборочной совокупности были пациенты как с эмметропической рефракцией — 8 глаз (0,8 %), так и с аномалиями рефракции — 992 глаза (99,2 %), из которых 978 глаз (97,8 %) имели миопическую рефракцию, 14 (1,4 %) — простой миопический астигматизм. 889 глаз (88,9 %) сочетали миопическую рефракцию с миопическим астигматизмом.</p> <p><bold>Результаты.</bold> На основании анализа 16 кератотопографических показателей и значений тонометрического внутриглазного давления 500 пациентов (1000 глаз) определено наибольшее влияние 13 изучаемых параметров роговицы, таких как <italic>K</italic><sub>1</sub> (кератометрия минимальная плоская), <italic>K</italic><sub>2</sub> (кератометрия максимальная крутая), <italic>K</italic><sub>m</sub> (средняя кератометрия), <italic>R</italic><sub>f</sub> (плоский меридиан радиуса), <italic>R</italic><sub>s</sub> (крутой меридиан радиуса), <italic>R</italic><sub>m</sub> (средний радиус кривизны), <italic>R</italic><sub>min</sub> (наименьший радиус кривизны), <italic>R</italic><sub>per</sub> (средний радиус кривизны между центром зоны 6 и 9 мм), IVA (индекс вертикальной асимметрии), ISV (индекс поверхностного отклонения), CKI (центральный индекс кератоконуса), Thickness (толщина), IHD [индекс высоты (роста) децентрации], на значения внутриглазного давления.</p> <p><bold>Выводы.</bold><italic> </italic>Исходя из полученных результатов, определено влияние топографических показателей роговицы на тонометрическое внутриглазное давление и создана формула для корректировки значений внутриглазного давления на основании разработанной нами оригинальной формулы: <italic>P</italic><sub>t</sub> keratotopographic corrected = <italic>P</italic><sub>t</sub> + (±ISV<sub>p</sub>) + (±IVA<sub>p</sub>) + + (±<italic>R</italic><sub>mp</sub>) + (±<italic>K</italic><sub>mp</sub>) + (±CKI<sub>p</sub>) + (±Thickness<sub>p</sub>), где <italic>P</italic><sub>t</sub> keratotopographic corrected — скорректированное тонометрическое внутриглазное давление, а <italic>P</italic><sub>t</sub> — тонометрическое внутриглазное давление.</p></trans-abstract><trans-abstract xml:lang="zh"><p/></trans-abstract><kwd-group xml:lang="en"><kwd>keratotopography</kwd><kwd>cornea</kwd><kwd>intraocular pressure</kwd><kwd>tonometry</kwd><kwd>recalculation</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>кератотопография</kwd><kwd>роговица</kwd><kwd>внутриглазное давление</kwd><kwd>тонометрия</kwd><kwd>перерасчёт</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Antonov AA, Astakhov YuS, Bessmertnyi AM. 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