Pupil
No, human eyes do not naturally reflect infrared light.
no a human is not a source of light
The light bounces off the object to get into our eyes. Actually there are many beams of light, but they don't all reach to your eyes.
It must enter our eyes.
The human eyes
Lights enters your eyes directly from a light source or it reflects off other objects
You only "see" when light enters your eyes. In the dark, there is no light . . . the main reason why we call it "dark". Since there is no light, none can enter your eyes, and you do not see.
Yes, light energy can be reflected by an object into your eyes. When light strikes an object, it can bounce off the surface in different directions. Some of this reflected light may enter your eyes, allowing you to see the object.
LED Light is Toxic to the eyes
No. Normally human eyeballs have their pupils behind their iris so that the eye can adjust to light but fish eyes have their pupils protruding through the iris so that it cannot adjust its eyes to light.
Because the lens has been focused depending on the available light. if you enter a darker room, your eyes have to re-adjust to allow more light through them.
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