A delle (plural dellen) is a shallow area of corneal thinning near the limbus. Dellen occur when raised abnormal bulbar conjunctiva prevents adequate lubrication of the cornea adjacent to the raised conjunctiva (Fig 14-7). Dellen are more likely to occur when the limbal approach to EOM surgery is used. They usually heal with time. Artificial tears or lubricants may be used until the chemosis subsides.
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.