Usage Guide Zoom in Zoom out
  • Wear your glasses, contacts or reading glasses
  • Keep screen and grid at a comfortable reading distance
  • If you are a MacTel patient, cover 1 eye and start countdown timer for dark adaptation. Uncover the eye and cover the other eye at end of countdown's beep, and stare at the dot in the center.
  • If you are not a MacTel patient, cover 1 eye and stare at the dot in the center
  • If the lines appear wavy, distored, dim, obscured or missing, please contact your ophthalmologist
  • Outline or draw the distorted areas with your finger or mouse.
  • If there are unusual colors, please use the color picker to choose closest corresponding color, and contact your ophthalmologist
  • Repeat the steps above with other eye