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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">helmholtzeyeinstitute</journal-id><journal-title-group><journal-title xml:lang="ru">Российский офтальмологический журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Ophthalmological Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2072-0076</issn><issn pub-type="epub">2587-5760</issn><publisher><publisher-name>Real time Publishers</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21516/2072-0076-2019-12-4-8-12</article-id><article-id custom-type="elpub" pub-id-type="custom">helmholtzeyeinstitute-331</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>КЛИНИЧЕСКИЕ ИССЛЕДОВАНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CLINICAL STUDIES</subject></subj-group></article-categories><title-group><article-title>Оптотип и таблица для прецизионных визометрических исследований</article-title><trans-title-group xml:lang="en"><trans-title>A new optotype and chart for precision visometry</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Алиев</surname><given-names>А-Г. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Aliev</surname><given-names>A-G. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p> д-р мед. наук, профессор, заведующий кафедрой глазных болезней № 1</p><p>пл. Ленина, д. 1, г. Махачкала, 367000, Российская Федерация, Республика Дагестан</p></bio><bio xml:lang="en"><p>Dr. of Med. Sci., Professor, Head of Chair of Ophthalmology № 1</p><p>1, Ploshchad Lenina, Makhachkala, 367000, Russia</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Алиев</surname><given-names>А. А-Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Aliev</surname><given-names>A. A-G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. мед. наук, заместитель директора по научно-исследовательской работе</p><p>ул. Набережная, д. 12, г. Каспийск, 368300, Российская Федерация, Республика Дагестан</p></bio><bio xml:lang="en"><p>Cand. of Med. Sci., deputy director for science</p><p>12, Naberezhnaya St., Kaspiysk, 368300, Russia</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>Нурудинов</surname><given-names>М. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Nurudinov</surname><given-names>M. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>врач-офтальмолог отделения новых технологий и витреоретинальной хирургии</p><p>ул. Набережная, д. 12, г. Каспийск, 368300, Российская Федерация, Республика Дагестан</p></bio><bio xml:lang="en"><p>ophthalmologist, department of vitreoretinal surgery and new technologies</p><p>12, Naberezhnaya St., Kaspiysk, 368300, Russia</p></bio><email xlink:type="simple">musail1988@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ГБОУ ВПО «Дагестанский государственный медицинский университет»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Chair of ophthalmology, Daghestan State Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ГБУ НКО «Дагестанский центр микрохирургии глаза»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Daghestan Center of Eye microsurgery</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>10</day><month>12</month><year>2019</year></pub-date><volume>12</volume><issue>4</issue><fpage>8</fpage><lpage>12</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Алиев А.Д., Алиев А.А., Нурудинов М.М., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Алиев А.Д., Алиев А.А., Нурудинов М.М.</copyright-holder><copyright-holder xml:lang="en">Aliev A.D., Aliev A.A., Nurudinov 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://roj.igb.ru/jour/article/view/331">https://roj.igb.ru/jour/article/view/331</self-uri><abstract><p>Цель работы — разработка и оценка достоверности нового оптотипа и таблицы для прецизионных визометрических исследований.</p><sec><title>Материал и методы</title><p>Материал и методы. Обследовано 56 пациентов в возрасте 16–57 лет. Критерием включения в исследование явилась максимальная острота зрения (ОЗ) 1,0 и более. ОЗ определяли с использованием трех разных оптотипов: стандартных буквенных оптотипов таблицы Сивцева — Головина, колец Ландольта и предлагаемого нами оптотипа.</p></sec><sec><title>Результаты</title><p>Результаты. На основе психометрического анализа результатов составлены соответствующие кривые. При использовании нового оптотипа число правильных ответов при ОЗ = 1,0 со- ставило 75 %, при ОЗ = 1,5 — 25 %, а при ОЗ = 2,0 — 10 %, в то время как при использовании колец Ландольта и стандартных буквенных оптотипов таблицы Сивцева — Головина получены следующие результаты: 1,0 — 50 %, 1,5 — 20 %, 2,0 — 10 % и 1,0 — 45 %, 1,5 — 15 %, 2,0 — 5 % соответственно.</p></sec><sec><title>Заключение</title><p>Заключение. Предложенные оптотип и таблица для визометрических исследований, построенная по принципу логарифмической прогрессии размеров оптотипов, позволяют в значительной мере повысить достоверность оценки ОЗ, а расширенный диа- пазон величин оптотипов повышает чувствительность методики визометрии.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Purpose</title><p>Purpose. To develop a new optotype and a chart for precision visometric tests and assess their accuracy.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. 56 patients aged 16 to 57 years with the maximum visual acuity (VA) of 1.0 or more were examined for VA using three types of optotypes: standard letter optotype based on the Sivtsev — Golovin table, Landolt rings, and a new optotype developed by the authors.</p></sec><sec><title>Results</title><p>Results. On the basis of the psychometric analysis, the corresponding curves were drawn. When using the new optotype, the share of correct answers for VA = 1.0 was 75 %, for VA = 1.5 — 25 %, and for VA = 2.0 — 10 %. In contrast, Landolt rings and Sivtsev — Golovin optotypes gave the following results, respectively: VA = 1.0 — 50 %, 1.5 — 20 %, 2.0 — 10 % and VA = 1.0 — 45 %, VA = 1.5 — 15 %, VA = 2.0 — 5 %.</p></sec><sec><title>Conclusion</title><p>Conclusion. The proposed optotype and the table for visometric tests, based on the principle of logarithmic progression of optotype sizes, significantly increase the accuracy of VA assessment. An extended range of optotype sizes increases the sensitivity of the visometry.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>визометрия</kwd><kwd>таблица для проверки остроты зрения</kwd><kwd>оптотип</kwd></kwd-group><kwd-group xml:lang="en"><kwd>visometry</kwd><kwd>visial acuity</kwd><kwd>optotype</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">Волков В.В., Горбань А.Н., Джалиашвили О.А. Клиническая визо- и рефрактометрия. Ленинград: Медицина; 1976. Volkov V.V., Gorban' A.N., Dzhaliashvili O.A. Clinical vision and refractometry. Leningrad: Meditsina; 1976 (in Russian).</mixed-citation><mixed-citation xml:lang="en">Волков В.В., Горбань А.Н., Джалиашвили О.А. Клиническая визо- и рефрактометрия. Ленинград: Медицина; 1976. Volkov V.V., Gorban' A.N., Dzhaliashvili O.A. Clinical vision and refractometry. Leningrad: Meditsina; 1976 (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Daza de Valdes B. The use of eye glasses. 1623. In: Runge P.E., ed. History of Ophthalmology. Wayenborgh, Belgium. 2004; 11.</mixed-citation><mixed-citation xml:lang="en">Daza de Valdes B. The use of eye glasses. 1623. In: Runge P.E., ed. History of Ophthalmology. Wayenborgh, Belgium. 2004; 11.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Jurin J. An essay on distinct and indistinct vision. In: A complete system of optics in four books, viz. a popular, a mathematical, a mechanical, and a philosophical treatise. Cambridge: Published by the author; 1738: 115–71.</mixed-citation><mixed-citation xml:lang="en">Jurin J. An essay on distinct and indistinct vision. In: A complete system of optics in four books, viz. a popular, a mathematical, a mechanical, and a philosophical treatise. Cambridge: Published by the author; 1738: 115–71.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Лещенко И.А. О системах и правилах определения остроты зрения. Вестник оптометрии. 2009; 3: 54–8. Leshchenko I.A. On systems and rules for the determination of visual acuity. Vestnik optometrii. 2009; 3: 54–8 (in Russian).</mixed-citation><mixed-citation xml:lang="en">Лещенко И.А. О системах и правилах определения остроты зрения. Вестник оптометрии. 2009; 3: 54–8. Leshchenko I.A. On systems and rules for the determination of visual acuity. Vestnik optometrii. 2009; 3: 54–8 (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Donders F.C. On the anomalies of accommodation and refraction. London: New Sydenham Society; 1864.</mixed-citation><mixed-citation xml:lang="en">Donders F.C. On the anomalies of accommodation and refraction. London: New Sydenham Society; 1864.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Colenbrander A. The historical evolution of visual acuity measurement. Vis. Impair. Res. 2008; 10: 57–66. https://doi.org/10.1080/13882350802632401</mixed-citation><mixed-citation xml:lang="en">Colenbrander A. The historical evolution of visual acuity measurement. Vis. Impair. Res. 2008; 10: 57–66. https://doi.org/10.1080/13882350802632401</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Snellen H. Letterproeven tot Bepaling der Gezictsscherpte. Utrecht, Weyers; 1867 (Dutch edition).</mixed-citation><mixed-citation xml:lang="en">Snellen H. Letterproeven tot Bepaling der Gezictsscherpte. Utrecht, Weyers; 1867 (Dutch edition).</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Воронцов Е.А., Черноусов А.С. Классификация методов и средств определения остроты зрения. Научно-технический вестник информационных технологий, механики и оптики. 2006; 28: 75–83. Vorontsov E.A., Chernousov A.S. Classification of methods and means for determining visual acuity. Nauchno-tekhnicheskiy vestnik informatsionnykh tekhnologiy, mekhaniki i optiki. 2006; 28: 75–83 (in Russian).</mixed-citation><mixed-citation xml:lang="en">Воронцов Е.А., Черноусов А.С. Классификация методов и средств определения остроты зрения. Научно-технический вестник информационных технологий, механики и оптики. 2006; 28: 75–83. Vorontsov E.A., Chernousov A.S. Classification of methods and means for determining visual acuity. Nauchno-tekhnicheskiy vestnik informatsionnykh tekhnologiy, mekhaniki i optiki. 2006; 28: 75–83 (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Landolt E. Bestimmung der Sehschärfe. In: Die Functionsprüfungen des Auges. Graefe-Saemisch Handbuch, 2nd edition; Leipzig; 1904.</mixed-citation><mixed-citation xml:lang="en">Landolt E. Bestimmung der Sehschärfe. In: Die Functionsprüfungen des Auges. Graefe-Saemisch Handbuch, 2nd edition; Leipzig; 1904.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Bennett A.G. Ophthalmic test types. Br. J. Physiol. Optics.1965; 22: 238–71.</mixed-citation><mixed-citation xml:lang="en">Bennett A.G. Ophthalmic test types. Br. J. Physiol. Optics.1965; 22: 238–71.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Sloan L.L. New test charts for the measurement of visual acuity at far and near distances. Am. J. Ophthalmol. 1959; 48: 807–13.</mixed-citation><mixed-citation xml:lang="en">Sloan L.L. New test charts for the measurement of visual acuity at far and near distances. Am. J. Ophthalmol. 1959; 48: 807–13.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Ferree C., Rand G. More nearly absolute method of testing and rating vision. Arch. Ophthalmol.1940; 24 (2): 292–315.</mixed-citation><mixed-citation xml:lang="en">Ferree C., Rand G. More nearly absolute method of testing and rating vision. Arch. Ophthalmol.1940; 24 (2): 292–315.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Jonkers G.H. A new optotype chart. Ophthalmologica. 1975; 171: 380–1. https://doi.org/10.1159/000307553</mixed-citation><mixed-citation xml:lang="en">Jonkers G.H. A new optotype chart. Ophthalmologica. 1975; 171: 380–1. https://doi.org/10.1159/000307553</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Ferris F.L., Kassov A., Bresnick G.H., Bailey I.L. New visual acuity charts for clinical research. Am. J. Ophthalmol. 1982; 94: 91–6.</mixed-citation><mixed-citation xml:lang="en">Ferris F.L., Kassov A., Bresnick G.H., Bailey I.L. New visual acuity charts for clinical research. Am. J. Ophthalmol. 1982; 94: 91–6.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Taylor H.R. Applying new design principles to the construction of an Illiterate E chart. Am. J. Optom. Physiol. Optics.1978; 55: 348–51.</mixed-citation><mixed-citation xml:lang="en">Taylor H.R. Applying new design principles to the construction of an Illiterate E chart. Am. J. Optom. Physiol. Optics.1978; 55: 348–51.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Ferree C., Rand G. The testing of visual acuity. Factors in the sensitive use of the test for the detection of errors of refraction. Am. J. Optom. 1934; 17 (1 Jan.): 29–36. https://doi.org/10.1016/S0002-9394(34)92090-0</mixed-citation><mixed-citation xml:lang="en">Ferree C., Rand G. The testing of visual acuity. Factors in the sensitive use of the test for the detection of errors of refraction. Am. J. Optom. 1934; 17 (1 Jan.): 29–36. https://doi.org/10.1016/S0002-9394(34)92090-0</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Вейнберг В.Б., Никольская Н.А. Таблицы для измерения остроты зрения. Проблемы физиологической оптики, изд.8. Москва: Издательство АН СССР; 1951: 329–52. Vejnberg V.B., Nikol'skaja N.A. Tables for determining visual acuity. Problemy fiziologicheskoj optiki, izd. 8. Moscow: Izdatel'stvo AN SSSR; 1951: 329–52 (in Russian).</mixed-citation><mixed-citation xml:lang="en">Вейнберг В.Б., Никольская Н.А. Таблицы для измерения остроты зрения. Проблемы физиологической оптики, изд.8. Москва: Издательство АН СССР; 1951: 329–52. Vejnberg V.B., Nikol'skaja N.A. Tables for determining visual acuity. Problemy fiziologicheskoj optiki, izd. 8. Moscow: Izdatel'stvo AN SSSR; 1951: 329–52 (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Westheimer G. Optotype recognition under degradation: comparison of size, contrast, blur, noise and contour perturbation effects. Clin. Exp. Optom. 2016; 99: 66–72. doi: 10.1111/cxo.12293</mixed-citation><mixed-citation xml:lang="en">Westheimer G. Optotype recognition under degradation: comparison of size, contrast, blur, noise and contour perturbation effects. Clin. Exp. Optom. 2016; 99: 66–72. doi: 10.1111/cxo.12293</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Алиев А-Г.Д., Исмаилов М.И. Исследование феномена псевдоаккомодации при интраокулярной коррекции афакии. Офтальмохирургия. 1999; 4: 38–42. Aliev A-G.D., Ismailov M.I. Investigation of the phenomenon of pseudo-accommodation for intraocular correction of aphakia. Oftal'mokhirurgiya. 1999; 4: 38–42 (in Russian).</mixed-citation><mixed-citation xml:lang="en">Алиев А-Г.Д., Исмаилов М.И. Исследование феномена псевдоаккомодации при интраокулярной коррекции афакии. Офтальмохирургия. 1999; 4: 38–42. Aliev A-G.D., Ismailov M.I. Investigation of the phenomenon of pseudo-accommodation for intraocular correction of aphakia. Oftal'mokhirurgiya. 1999; 4: 38–42 (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Sergienko N.M., Aliyev A-H.D. Correcting astigmatism. Optom. Vis. Sci. 1989; 66 (3): 167–9.</mixed-citation><mixed-citation xml:lang="en">Sergienko N.M., Aliyev A-H.D. Correcting astigmatism. Optom. Vis. Sci. 1989; 66 (3): 167–9.</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Monoyer F. Echelle typographique décimale pour mesurer l'acuit visuelle. Gaz. Med. Paris.1875; 21: 258.</mixed-citation><mixed-citation xml:lang="en">Monoyer F. Echelle typographique décimale pour mesurer l'acuit visuelle. Gaz. Med. Paris.1875; 21: 258.</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Bailey I.L., Lovie J.E. New design principles for visual acuity letter charts. Am. J. Optom. Physiol. Opt.1976; 53: 740.</mixed-citation><mixed-citation xml:lang="en">Bailey I.L., Lovie J.E. New design principles for visual acuity letter charts. Am. J. Optom. Physiol. Opt.1976; 53: 740.</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Проскурина О.В., Розенблюм Ю.З., Бершанский М.И. Таблица для исследования остроты зрения у детей. Вестник офтальмологии. 1998; 3: 43–5. Proskurina O.V., Rozenblum Yu.Z., Bershanskiy M.I. Сhart for the study of visual acuity in children. Vestnik oftal'mologii. 1998; 3: 43–5 (in Russian).</mixed-citation><mixed-citation xml:lang="en">Проскурина О.В., Розенблюм Ю.З., Бершанский М.И. Таблица для исследования остроты зрения у детей. Вестник офтальмологии. 1998; 3: 43–5. Proskurina O.V., Rozenblum Yu.Z., Bershanskiy M.I. Сhart for the study of visual acuity in children. Vestnik oftal'mologii. 1998; 3: 43–5 (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Alexander K., Xie W., Derlacki D. Visual acuity and contrast sensitivity for individual sloan letters. Vision Res. 1997; 37 (6 Mar.): 813–9. https://doi.org/10.1016/S0042-6989(96)00190-3</mixed-citation><mixed-citation xml:lang="en">Alexander K., Xie W., Derlacki D. Visual acuity and contrast sensitivity for individual sloan letters. Vision Res. 1997; 37 (6 Mar.): 813–9. https://doi.org/10.1016/S0042-6989(96)00190-3</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">Tokutake T., Mita N., Kawamoto K.-I., et al. Relation between visual acuity and slope of psychometric function in young adults. i-Perception. 2011; 2: 308–8. doi: 10.1068/ic308</mixed-citation><mixed-citation xml:lang="en">Tokutake T., Mita N., Kawamoto K.-I., et al. Relation between visual acuity and slope of psychometric function in young adults. i-Perception. 2011; 2: 308–8. doi: 10.1068/ic308</mixed-citation></citation-alternatives></ref><ref id="cit26"><label>26</label><citation-alternatives><mixed-citation xml:lang="ru">Simpson T. Vision thresholds from psychometric analyses: alternatives to Probit analysis. Optom. Vis. Sci. 1995; 72: 371–7. doi:10.1097/00006324-199506000-00004</mixed-citation><mixed-citation xml:lang="en">Simpson T. Vision thresholds from psychometric analyses: alternatives to Probit analysis. Optom. Vis. Sci. 1995; 72: 371–7. doi:10.1097/00006324-199506000-00004</mixed-citation></citation-alternatives></ref><ref id="cit27"><label>27</label><citation-alternatives><mixed-citation xml:lang="ru">Schulze-Bonsel K., Feltgen N., Burau H., Hansen L., Bach M. Visual acuities “hand motion” and “counting fingers” can be quantified with the freiburg visual acuity test. Invest. Ophthalmol. Vis. Sci. 2006; 47 (3 Mar.): 1236–40. doi:10.1167/iovs.05-0981</mixed-citation><mixed-citation xml:lang="en">Schulze-Bonsel K., Feltgen N., Burau H., Hansen L., Bach M. Visual acuities “hand motion” and “counting fingers” can be quantified with the freiburg visual acuity test. Invest. Ophthalmol. Vis. Sci. 2006; 47 (3 Mar.): 1236–40. doi:10.1167/iovs.05-0981</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
