Begin by obtaining informed consent from the parents of the child to be tested with an eye tracking calibration system and describe the study format to them. Position the child to be tested at 55 centimeters from the display monitor in the parent's lap. Adjust the position of the lifting table to place it with the monitor so that the screen is perpendicular to the child's eyes.
Adjust the webcam's position to ensure that the child's face is visible in the recording system and to avoid capturing faces other than the child's. Before starting the procedure inform the child that they will watch the screen. Instruct the parent to prompt the child to look at the screen when the child is not paying attention.
Then open the automated acuity card procedure or AACP software and type the child's information including name, sex, and age into the software. Click on the start button to calibrate the procedure. A graphics interchange format, or GIF image appears against a white background in the center of the screen for at least three seconds.
The analysis system simultaneously determines whether the child's line of sight is fixated on the image by showing green dot on the screen. If the gaze data is not available within a minute, the screen presents another cartoon GIF image. When gaze coordinates are detected within this region, the test procedure starts without the tester's action and runs automatically.
