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".
