1.   Appalling Others show real-life autopsies, filmed for medical purposes, showing the removal of human eyes, tongues and scalps.

2.   Bacteria cannot be seen with the human eye.

3.   Infra-red light is invisible to the human eye.

4.   It is quite amazing how much the human eye actually misses when we walk from place to place.

5.   Since the human eye moves horizontally with less fatigue than vertically, the cone of vision tends to be flattened.

6.   The human eye and brain are much happier reading short to medium length unjustified lines although books are conventionally justified.

7.   The human eye is capable of perceiving thousands of insignificant details.

8.   The variations of color that a human eye can see are infinite.

9.   The world picture is distorted by being seen through human eyes.