Depth perception depends on our visual cortex creating a three-dimensional image of our surroundings so that we can perform the following activities safely.
The diagram below shows how your brain determines distance and movement.
At the entrance of the visual cortex, (Stage 4 above), all electrical signals are divided and sent to five different areas (v1, v2, v3, v4, v5) for processing. Each of these areas processes a specific attribute of visual perception: colour, orientation, contrasts, movement, and spatial frequency. Our brain then interprets these 5 characteristics of the perceived object.
In a matter of milliseconds, the brain (not the eyes!) is capable of reconstructing the image, interpreting it as a green and stationary apple, but it also allows us to act if necessary (e.g., catch the apple if it were in motion).
IRLEN LENSES REMOVE THESE DISTORTIONS FROM PRINT AND ALLOW CHILDREN AND ADULTS TO PROCESS THE PRINT SUCCESSFULLY.
