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ophthalmology cornea conjunctival flaps debridement of corneal ulcer glue with bandage contact lens optical keratoplasty therapeutic keratoplasty tectonic keratoplasty penetrating keratoplasty keratitis ophthalmology residency basic examination of eyes optometry medicine healthcare science undergraduate training ulcer undergraduate trainees mbbs learning sessions daycare procedures in ophthalmology opd surgeries in ophthalmology minor ot procedures in ophthalmology ocular instruments minor ophthalmic procedures posterior segment lens anterior chamber conjunctiva slit lamp examination indirect ophthalmoscope direct ophthalmoscope fundus examination tonometry confrontation fields test visual acuity