![]() Insects do perceive ultraviolet light, but their compound eyes don't focus as sharply as human eyes, so the energy is spread out over a larger area. The reason humans evolved to not see UV light is because the light has enough energy to damage the rods and cones. The lens absorbs it before it can reach the retina. People don't see ultraviolet light, but the human retina can detect it.If you wear special goggles that make you view everything upside down, after a few days your brain will adapt, again showing you the "correct" view. When the brain translates the image, it automatically flips it. The eye acts exactly like a camera in the sense that the image formed on the retina is inverted (upside down).The functioning of the eye is fairly simple, but there are some details you might not know: The vitreous humor is a transparent watery gel that supports the eye and allows for this distance. Vitreous Humor: A certain distance is required to focus light.Ciliary muscles surround the lens, relaxing to flatten it to image distant objects and contracting to thicken the lens to image close-up objects. Lens: While most of the focusing of light is done by the cornea, the lens allows the eye to focus on either near or distant objects. ![]() As the pupil dilates (gets bigger), more light enters the eye. The size of the pupil is determined by the iris, the contractile ring that is associated with eye color.
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