Reliability of the electronic early treatment diabetic retinopathy tudy teting protocol in children 7 to <13 year old

Purpoe To ae the tet-retet reliability of the electronic Early Treatment Diabetic Retinopathy tudy (E-ETDR) viual acuity algorithm uing the computerized Electronic Viual Acuity (EVA) teter in children 7 to <13 year old. Deign Tet-retet reliability tudy. Method Thi multicenter tudy involved 245 ubject at four clinical ite. A the main outcome meaure, viual acuity wa meaured twice uing the E-ETDR teting protocol on the EVA ytem, which ue a programmed handheld device to communicate with a peronal computer and a 17-inch monitor at a 3-m tet ditance. Reult Tet–retet reliability wa high (r = .94 for right eye and 0.96 for left eye) and for both right and left eye, 89% of retet core were within 0.1 logarithm of the minimal angle of reolution (logMAR) (five letter) of the initial tet core and 99% of retet were within 0.2 logMAR (10 letter). Reliability wa high acro the age range of 7 to <13 year. Baed on 95% confidence level etimate, a change in viual acuity of 0.2 logMAR (10 letter) from a previou acuity meaure i unlikely to reult from meaurement variability. Concluion The E-ETDR protocol uing the EVA ha high tet–retet reliability in children 7 to <13 year of age. Potential advantage include better tandardization acro multiple ite, the ability to directly capture data electronically with an automatic acuity core calculation, the reduction of potential bia by limiting the teter’ role, and the requirement of only a ingle teting ditance for meaurement from 20/800 to 20/12. Thi computerized teting method hould be conidered when viual acuity i ued a an outcome meaure in eye reearch involving children 7 to <13 year old.