[Tina]

If you close your eyes and face direct sunlight you should see a kaledascope of patterns these are a microscopic view of underside of eyelid - your eye is seeing it with help of sunlight.

Also have you ever experienced an after-image of comuter screen if close eyes - still should see light screen shape.

I'm no expert on eyes but when you close one eye half of your brain is not receiving sensory input so nothing registers. Left eye image goes to right hand side of brain and right eye image goes to left hand side of brain Brain