Arlt's line

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|specialty = Ophthalmology

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|causes = Chlamydia trachomatis

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|differential = Trachoma

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Arlt's line is a thick band of scar tissue in the conjunctiva of the eye, near the lid margin,{{cite book|first1=Gerald L. |last1=Mandell |first2=John E. |last2=Bennett |first3=Raphael |last3=Dolin |title=Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases|year=2010|publisher=Churchill Livingstone/Elsevier|location=Philadelphia, PA|isbn=978-0-443-06839-3|page=1534|edition=7th}} that is associated with eye infections. Arlt's line is a characteristic finding of trachoma, an infection of the eye caused by Chlamydia trachomatis. The line runs horizontally, parallel to eyelid, and is found at the junction of the anterior one third and posterior two thirds of the conjunctiva.{{cite book|last1=Yanoff|first1=Myron|last2=Duker|first2=Jay S.|title=Ophthalmology|year=2008|publisher=Mosby|location=Edinburgh|isbn=978-0323057516|pages=230|edition=3rd}}

The line is named after the Austrian ophthalmologist Carl Ferdinand von Arlt.