Support Snellen Chart, Tumbling E Chart. Option to have shorter middle arm, Landolt C Chart, ETDRS Chart, HOTV Chart and Numbers.
Support test scenarios: "Doctor" and "Patient"; self-diagnosis with a mirror or with a Bluetooth keyboard.
Support test modes: Autoplay and Manual.
Adjustable brightness independent of device's brightness setting.
Custom test distance.
Voice hint for "Doctor" and "Patient" scenario.
Record scores of multiple "patients".