1548 Refining the Usability of a Novel Visual Field Assessment App

Abstract

Abstract Introduction A validated visual field chart designed as a simpler adjunct to formal perimeters is being developed into an app. The app aims to empower patients with pituitary tumours to independently assess their central 25˚ visual field with intra-app instructions and share their results with their clinician. NHSx marked usability as an assessment criterion for validating health apps. This study aims to explore and improve the usability of the beta-version of the app. Method Qualitative methods were employed through observation and semi-structured interviews. Recruitment was through convenience sampling. Participants experienced the app solely based on the intra-app information. Meanwhile, a researcher observed the process. Then, qualitative feedback was generated through semi-structured interviews. Observational data was coded and quantified. Thematic analysis was employed to identify common themes and/or categories of the qualitative feedback. Results 15 participants between 24-58(mean 33.7, SD 10.8) years were recruited. Observational data revealed that 1/15 adhered to all 3 written instructions; 3/15 utilised the hand span distance guidance provided. Participants’ responses on feedback for improvements were coded and categorised. Suggested additional features for improvement – a run-through introduction to the app, a video example of how to conduct the test, a practice run, an option for audio instruction and an option to change font size and type. Suggested additional instructions were to focus on the black dot and remember what you were seeing with the red dots. Conclusions Qualitative methods identified aspects of the app requiring improvements. Participants feedback will be utilised to improve the app.