Figure 1
Card Task and Blind Spot Task procedures that are used to calculate the viewing distance using the Virtual Chinrest. (a) Card Task: Participants are asked to place a credit card or a card of equal size on the screen, and adjust the slider until the size of the image of the card on the screen matches the real-world card. We can therefore calculate the logical pixel density (LPD) of the display in pixels per inch to estimate distance s in Fig. 2. (b) Blind Spot Task: Participants are asked to fixate on the static black square with their right eye closed while the red dot repeatedly sweeps from right to left; they are asked to press the spacebar when they perceive the red dot as disappearing. We then calculate the distance between the center of the black square and the center of the red dot when it disappears from the eye sight.
