A 62 year old woman with keratoconjunctivitis sicca is most likely to demonstrate corneal staining in which location?: (A) Superior third, (B) Middle third (interpalpebral), (C) Inferior third, (D) Diffuse over entire cornea
Answer is B. Rose Bengal staining is a very useful test for detecting even mild cases of Kerato conjuctivitis sicca .Depending upon the severity of Kerato conjunctivitis sicca three staining patterns A, B and C have been described: 'C' pattern represents mild or early cases with fine punctate stains in th.e interpalpebral area; 'B' the moderate cases with extensive staining; and 'A' the severe cases with confluent staining of conjunctiva and cornea. Thus the women is most likely to demonstrate staining in interpalpebral area.