This short note does some calculations regarding the bandwidth of the eye, viewed as an input device.
This is followed by a consideration of the body as a gesterual output device.
Information acquistion, information delivery.
How Many Pixels Does an Eyeball Have?
How many vision receptors are there?
What is the spatial and temporal resolution of the eye?
At what rate can the body express information to the outside world?
First Guess: The Eye has 90 Million "Pixels".
The figure above implies a reasonable value for optical receptor density is 100,000 receptors per square millimeter. Retinal coverage of is nearly 180 degrees. To compute the receptor count we need the diameter of the eye. The radius of the average eye is 12 mm. This implies that the surface area is 2 p r2 or 904.7 square millimeters. This first ordercalculation implies that average eye contains 90 million receptors. Most people have two. Eyes that is. When building display devices, it is convenient to give pixels Cartesian (i, j) or (x, y) coordinates. Based on this, if we were to build a display device that could simultaneously excite all the optical receptors, and if this display device were a square, there would be 9512 pixels on an edge.