title: Trabeculectomy trapdoor separation with allergic periorbital dermatitis: an unusual late-onset complication of guarded filtration surgery.
abstract: Hypotony post trabeculectomy may be the result of excessive aqueous outflow. Herein a case of an elderly man with excessive filtration 2 years post trabeculectomy resulting from trapdoor separation associated with allergic periorbital dermatitis is presented. Quaternary ammonium compounds are a significant cause of allergic periorbital dermatitis. Chronic rubbing associated with allergies to multiple topical quaternary ammonium compound-containing ophthalmic preparations is likely to have contributed to the trapdoor autotrauma and separation in this man with a background of allergic contact dermatitis.
authors.forename: Kenneth G-J
authors.initials: KG
authors.lastname: Ooi
authors.forename: Paul A
authors.initials: PA
authors.lastname: Adler
authors.forename: Ivan
authors.initials: I
authors.lastname: Goldberg
mesh_terms: D000369:Aged, 80 and over; D000959:Antihypertensive Agents / Q000627:therapeutic use; D001548:Benzalkonium Compounds / Q000009:adverse effects; D003228:Conjunctiva / Q000187:drug effects; D017449:Dermatitis, Allergic Contact / Q000209:etiology*; D006801:Humans; D008297:Male; D015814:Ocular Hypotension / Q000209:etiology*; D009916:Orbital Diseases / Q000139:chemically induced*; D011108:Polymers / Q000009:adverse effects; D011310:Preservatives, Pharmaceutical / Q000009:adverse effects*; D014130:Trabeculectomy / Q000009:adverse effects*
chemical_list: D000959:Antihypertensive Agents; D001548:Benzalkonium Compounds; D011108:Polymers; D011310:Preservatives, Pharmaceutical; C058655:polyquaternium 1