Dellen is-: (A) Localized thinning of peripheral cornea, (B) b) Raised lesions in corneo limbal junction, (C) Age related macular degeneration, (D) Marginal keratitis
Answer is A. Impaired eyelid function. It is seen in patientswith Bell's palsy, exposure keratitis, dellen,symblepharon, pterygium, nocturnal lagophthalmosand ectropion. REF:Comprehensive ophthalmology,20th edition,AK Khurana,pg no.365.