Visual Acuity Apps for Rapid Integration in Teleconsultation Services in all Resource Settings: A Review.

Purpose There is a need for a simple and accurate way to assess visual acuity in telemedicine consultations in ophthalmology and other related specialties. Design We surveyed visual acuity testing apps available that allow patients to measure their own acuity, focusing on freely accessible resources suitable for all resource settings. Methods A systematic search was performed for visual acuity testing apps on 2 major platforms: Google Play Store (Google, CA, USA) and Apple App Store (Apple, CA, USA). Results Sixteen apps (67%) tested near vision, 5 apps (21%) tested distance vision, and 3 apps (13%) offered options for both near and distance vision testing. Of the 24 apps, 5 (21%) offered a method of calibration of optotype size. Three apps (13%) demonstrated evidence of clinical validation. Only 3 apps fulfilled our criteria for suitability for clinical practice. Conclusions We have recommended 3 apps that may be quickly integrated into clinical practice in both ophthalmic and non-ophthalmic all resource settings.