Automated Measurement of Visual Acuity in Pediatric Ophthalmic Patients Using Principles of Game Design and Tablet Computers

Abstract Purpose To report on the utility of a computer tablet based method for automated testing of visual acuity in children based upon the principles of game design. We describe the testing procedure and present repeatability as well as agreement of the score with accepted visual acuity measures. Design Reliability and validity study Methods • Setting : Manchester Royal Eye Hospital Pediatric Ophthalmology Outpatients Department. • Patient Population : 112 sequentially recruited patients. • Intervention : For each patient one eye was tested with the Mobile Assessment of Vision by intERactIve Computer for Children (MAVERIC-C) system consisting of a software application running on a computer tablet, housed in a bespoke viewing chamber. The application elicited touch screen responses using a game design to encourage compliance and automatically acquire visual acuity scores of participating patients. Acuity was then assessed by an examiner with a standard chart-based near ETDRS acuity tests before the MAVERIC-C assessment was repeated. • Main Outcome Measure : Reliability of MAVERIC-C near visual acuity score and agreement of MAVERIC-C score with near ETDRS chart for visual acuity. Results 106 children (95%) completed the MAVERIC-C system without assistance. The vision scores demonstrated satisfactory reliability, with test-retest VA scores having a mean difference of 0.001 (SD ±0.136) and limits of agreement of 2SD (LOA) of ±0.267. Comparison with the near EDTRS chart showed agreement with a mean difference of -0.0879 (±0.106) with LOA of ±0.208. Conclusions This study demonstrates promising utility for software using a game design to enable automated testing of acuity in children with ophthalmic disease in an objective and accurate manner.