Using Bluetooth Keyboard

When you are alone, a Bluetooth keyboard may help you to respond to the app running on the mobile device more than 2 meters away. You may make the mobile device standing on a table facing you a few meters away, and the app is running in the Auto-scoring mode which could calculate VA scores. Depending on which eye chart you are using, you may do the following:

  • Press [Enter/Return] to start/pause auto-play. And press [Tab] to abort auto-play.
  • For Snellen, ETDRS and HOTV, you press respective letter keys to respond to each optotype displayed on the screen.
  • For Numbers, you may press the number key when you identify what number displayed. The number keys on the numpad of a full keyboard can be used.
  • For Tumbling E and Landolt C, you may press arrow keys to respond to the direction of the opening of the optotype. And in QWERTY keyboard, you can use WAXD for Up, Left, Down, and Right. Please check the mapping below:
    • Up:  Up arrow, W, Page Up, Numpad 8
    • Down: Down arrow, X, Page Down, Numpad 2
    • Left: Left arrow, A, Numpad 4
    • Right: Right arrow, D, Numpad 6
    • Up left: Q, Numpad 7, Up left
    • Down left: Z, Numpad 1, Down left
    • Up right: E, Numpad 9, Up right
    • Down right: C, Numpad 3, Down right

Remarks:

  • Using a keyboard is practical if you can do touch typing without watching the keyboard. Watching the keyboard with an arm-reach distance then staring at the eye chart a few meters aways may impact on the accuracy of the test.
  • Using a gamepad for Tumbling E chart is OK.

Hints:

  • If you are a GP, you may let the patient use the keyboard if the patient is familiar with touch typing on a physical QWERTY keyboard.

Keyboards:

Basic:


Full: