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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">ophthalmology</journal-id><journal-title-group><journal-title xml:lang="ru">Офтальмология</journal-title><trans-title-group xml:lang="en"><trans-title>Ophthalmology in Russia</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1816-5095</issn><issn pub-type="epub">2500-0845</issn><publisher><publisher-name>Ophthalmology</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18008/1816-5095-2021-3-591-600</article-id><article-id custom-type="elpub" pub-id-type="custom">ophthalmology-1618</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>КЛИНИЧЕСКИЙ СЛУЧАЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CASE REPORT</subject></subj-group></article-categories><title-group><article-title>Рецидивирующий кератоконус. Клинический случай</article-title><trans-title-group xml:lang="en"><trans-title>Recurrent Keratoconus. Clinical Case</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3954-6233</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Коновалов</surname><given-names>М. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Konovalov</surname><given-names>M. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Коновалов Михаил Егорович - доктор медицинских наук, профессор, главный врач </p><p>ул. 3-я Тверская-Ямская, 56/6, Москва, 125047</p></bio><bio xml:lang="en"><p>Konovalov Mikhail E., MD, Professor, head doctor </p><p>3 Tverskaya-Yamskaya str., 56/6, Moscow, 125047</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4585-5339</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бурдель</surname><given-names>К. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Burdel</surname><given-names>K. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Бурдель Константин Владимирович - врач</p><p>ул. 3-я Тверская-Ямская, 56/6, Москва, 125047</p></bio><bio xml:lang="en"><p>Burdel Konstantin V., Оphthalmologist </p><p>3 Tverskaya-Yamskaya str., 56/6, Moscow, 125047</p></bio><email xlink:type="simple">konstantinburdel@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8705-9368</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Зенина</surname><given-names>М. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Zenina</surname><given-names>M. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Зенина Мария Леонидовна - кандидат медицинских наук, заместитель главного врача</p><p>ул. 3-я Тверская-Ямская, 56/6, Москва, 125047</p></bio><bio xml:lang="en"><p>Zenina Maria L., PhD, deputy head doctor </p><p>3 Tverskaya-Yamskaya str., 56/6, Moscow, 125047</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Резникова</surname><given-names>А. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Reznikova</surname><given-names>A. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Резникова Александра Борисовна - врач</p><p>ул. 3-я Тверская-Ямская, 56/6, Москва, 125047</p></bio><bio xml:lang="en"><p>Reznikova Alexandra B., ophthalmologist </p><p>3 Tverskaya-Yamskaya str., 56/6, Moscow, 125047</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3597-2101</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Коновалова</surname><given-names>М. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Konovalova</surname><given-names>M. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Коновалова Мария Михайловна - кандидат медицинских наук, врач</p><p>2-й Боткинский пр-д, 5, корп. 22, Москва, 125284</p></bio><bio xml:lang="en"><p>Konovalova Maria M., PhD, ophthalmologist </p><p>2nd Botkinskiy travel, 5/22, Moscow,125284</p></bio><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ООО «Офтальмологический центр Коновалова»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Konovalov Eye Center</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Офтальмологический центр Коновалова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Konovalov Eye Center</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>ГБУЗ «Городская клиническая больница имени С.П. Боткина Департамента здравоохранения города Москвы»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>S. Botkin City Clinical Hospital</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>01</day><month>10</month><year>2021</year></pub-date><volume>18</volume><issue>3</issue><fpage>591</fpage><lpage>600</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Коновалов М.Е., Бурдель К.В., Зенина М.Л., Резникова А.Б., Коновалова М.М., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Коновалов М.Е., Бурдель К.В., Зенина М.Л., Резникова А.Б., Коновалова М.М.</copyright-holder><copyright-holder xml:lang="en">Konovalov M.E., Burdel K.V., Zenina M.L., Reznikova A.B., Konovalova M.M.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.ophthalmojournal.com/opht/article/view/1618">https://www.ophthalmojournal.com/opht/article/view/1618</self-uri><abstract><sec><title>Цель</title><p>Цель: представить клинический случай рецидивирующего кератоконуса из нашей практики. В клинику обратилась пациентка с жалобой на снижение остроты зрения правого глаза. Был проведен ряд стандартных инструментальных обследований и Шеймпфлюг-кератотопография, диагностирован астигматизм правого глаза. Аналогичное обследование было проведено в динамике. По результатам сканирующей Шеймпфлюг-кератотопографии были поставлен диагноз «кератоконус» (forme fruste). При осмотре через 1 год отсутствовали жалобы на снижение остроты зрения и данные инструментальных обследований, свидетельствующие о кератоконусе. Пациентка обратилась через 3,5 года с жалобами на вновь снизившуюся остроту зрения правого глаза. При проведении инструментальных обследований и кератотопографии получены данные, указывающие на наличие заднего кератоконуса. Через 1 год состоялся контрольный осмотр, жалобы отсутствовали. Данные инструментальных исследований идентичны предыдущему визиту, при кератотопографии выявлено снижение задней элевации.</p></sec><sec><title>Обсуждение и вывод</title><p>Обсуждение и вывод. Выявлено, что пациентка постоянно принимала препарат гидроксимочевины на фоне системного заболевания вплоть до 3-го визита, на момент 4-го визита 1 год не принимала. В литературе есть публикации о влиянии данного типа препаратов на коллаген дермы кожи, тип которого соответствует коллагену роговицы. Мы предполагаем, что лекарственные препараты могут оказывать влияние на биомеханические свойства роговицы, что требует дальнейшего глубокого изучения.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Purpose</title><p>Purpose: To provide a clinical case of recurrent keratoconus from our practice.</p></sec><sec><title>Materials and method</title><p>Materials and method. A patient came to the clinic with a complaint of decreased visual acuity in the right eye. A series of standard instrumental examinations and Scheimpflug keratotopography were performed, and astigmatism of the right eye was diagnosed. Similar examinations were carried out during the patient’s attendance at follow-up examinations.</p></sec><sec><title>Results</title><p>Results. Based on the results of scanning Scheimpflug keratotopography, the diagnosis of keratoconus (forme fruste) was made. On examination after 1 year, there were no complaints of decreased visual acuity and data from the same instrumental examinations indicating keratoconus. After this examination, the patient came 3.5 years later with complaints of a new decreased visual acuity in the right eye. During instrumental examinations and keratopography, data were obtained indicating the presence of posterior keratoconus. After 1 year, a follow-up examination took place without complaints. The data of instrumental studies are identical to the previous visit; keratotopography revealed a decrease in posterior elevation.</p><p>Discussion and conclusion. It was revealed that the patient was constantly taking the hydroxyurea drug against the background of systemic disease up to the 3rd visit, at the time of the 4th visit she had not taken it for 1 year. There are publications in the literature on the effect of this type of drugs on the collagen of the dermis of the skin, the type of which corresponds to the collagen of the cornea. We hypothesize that drugs may have an effect on the biomechanical properties of the cornea, which requires further in-depth study.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>кератоконус</kwd><kwd>задний кератоконус</kwd><kwd>роговица</kwd><kwd>гидроксимочевина</kwd></kwd-group><kwd-group xml:lang="en"><kwd>keratoconus</kwd><kwd>posterior keratoconus</kwd><kwd>cornea</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Егорова Г.Б., Рогова А.Я. Кератоконус. 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