<prompt> ETDRS vision chart study is done in patients with diabetic retinopathy. ETDRS stands for :Extended therapy for diabetic retinopathy its studyEmergency treatment for diabetic retinopathy and studyEye testing or rotatory drum its studyEarly treatment for diabetic retinopathy study  <response>: Ans. is d i.e., Early treatment for diabetic retinopathy study By seeing these type of questions, dont make an impression that anything can be asked from anywhere in PG exams. These are always 2-3 rare questions in a paper and they are very rarely repeated. Dont let them deter you from preparing the most probable topics and questions. Prepare the most probable and most probably you get selected. 