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Cylindrical lens
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<h2 id="uses">Uses</h2> <h3>Uses in optometry</h3> <ul><li>Cylindrical lenses are prescribed to correct <a href="/facts/Astigmatism/r6xCWw56">astigmatism</a>.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a></li> <li><a href="/facts/Cross_cylinder/sgMXJa71">Cross cylinder</a>, which is a combination of two cylindrical lenses with equal strength and opposite power, is used in subjective refraction to diagnose astigmatism, and assess the strength and axis of the astigmatic power etc.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a></li> <li><a href="/facts/Maddox_rod/H7Lh3yqd">Maddox rods</a>, made up of cylindrical lenses arranged in parallel, are used to detect <a href="/facts/Strabismus/HzSXdF24">strabismus</a> and <a href="/facts/Diplopia/wYoJ9Khj">diplopia</a>.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a></li></ul> <h3>Other uses</h3> <ul><li>In a <a href="/facts/Light_sheet_fluorescence_microscopy/R1R5fx8c">light sheet microscope</a>, a cylindrical lens is placed in front of the illumination <a href="/facts/Objective_(optics)/6smChS48">objective</a> to create the light sheet used for imaging.</li> <li>Cylindrical lenses are used in optical spectrometers.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a></li> <li>Cylindrical lenses are used in <a href="/facts/Holography/4J1gW0M6">holography</a>.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a></li> <li>Doublet cylinder lens system is used in <a href="/facts/Optical_coherence_tomography/CqoqaP2a">optical coherence tomography</a>.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a></li> <li>Cylinder lenses are also used in many laser applications. A cylindrical lens can be used to create a laser line. A doublet cylinder lens is used to make laser sheets and circularize elliptical beams from laser diodes.<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a></li></ul> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Lenticular_lens/GpWCMA0q">Lenticular lens</a></li> <li><a href="/facts/Jackson_cross_cylinder/sgMXJa71">Jackson cross cylinder</a></li></ul> <h2 id="other-sources">Other Sources</h2> <ul><li>Jacobs, Donald H. Fundamentals of Optical Engineering. MC Graw-Hill Book Co., 1943.</li></ul> <h2 id="external-links">External links</h2> <ul><li> Media related to Cylindrical lenses at Wikimedia Commons</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Singh, Arvind Tiwari & Sachin (2016). Pathfinder for Olympiad and JEE (Advanced) Physics. Pearson India. ISBN 978-93-325-8139-5. <a href="978-93-325-8139-5" target="_blank">978-93-325-8139-5</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Khurana, AK (September 2008). "Light and optics". Theory and practice of optics and refraction (2nd ed.). Elsevier. p. 24. ISBN 978-81-312-1132-8. <a href="978-81-312-1132-8" target="_blank">978-81-312-1132-8</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Jacksons Cross Cylinder (JCC)" (PDF). Journal of Kerala Society of Ophthalmic Surgeons. <a href="http://ksos.in/ksosjournal/journalsub/Journal_Article_9_102.pdf" target="_blank">http://ksos.in/ksosjournal/journalsub/Journal_Article_9_102.pdf</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Dissimilar Image Tests". www.aao.org. <a href="https://www.aao.org/bcscsnippetdetail.aspx?id=c964238e-4121-4346-90e2-043186bb1869" target="_blank">https://www.aao.org/bcscsnippetdetail.aspx?id=c964238e-4121-4346-90e2-043186bb1869</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Fu, Xiao; Duan, Fajie; Jiang, Jiajia; Huang, Tingting; Ma, Ling; Lv, Changrong (1 October 2017). "Astigmatism-corrected echelle spectrometer using an off-the-shelf cylindrical lens". Applied Optics. 56 (28): 7861–7868. doi:10.1364/AO.56.007861. ISSN 2155-3165. PMID 29047771. <a href="https://www.osapublishing.org/ao/abstract.cfm?uri=ao-56-28-7861" target="_blank">https://www.osapublishing.org/ao/abstract.cfm?uri=ao-56-28-7861</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Xiao, Dan; Wei, Rong; Liu, Su-Juan; Wang, Qiong-Hua (1 December 2018). "Holographic magnification system based on cylindrical lens". Optik. 174: 707–714. doi:10.1016/j.ijleo.2018.06.103. ISSN 0030-4026. S2CID 125502339. <a href="https://www.sciencedirect.com/science/article/abs/pii/S0030402618309082" target="_blank">https://www.sciencedirect.com/science/article/abs/pii/S0030402618309082</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Shijun Xu, Xiaoling Ren (13 January 2017). "Fast Tomography Imaging System for Material Surface Based on Doublet-cylinder-lens in Intelligent OCT". ResearchGate. <a href="https://www.researchgate.net/publication/314783358" target="_blank">https://www.researchgate.net/publication/314783358</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>"Cylinder Lens | Edmund Optics". www.edmundoptics.com. <a href="https://www.edmundoptics.com/campaigns/cylinder-lens/#:~:text=Lenses%20with%20Optical%20Power%20in%20One%20Axis&text=Cylinder%20lenses%20are%20crucial%20to,laser%20line%20onto%20a%20surface." target="_blank">https://www.edmundoptics.com/campaigns/cylinder-lens/#:~:text=Lenses%20with%20Optical%20Power%20in%20One%20Axis&text=Cylinder%20lenses%20are%20crucial%20to,laser%20line%20onto%20a%20surface.</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> </ol>