The Iris.
Sclera
silver
brown.
brown
No
Color blindness is not something that one can do to oneself intentionally. Colorblindness results from a defect within certain cells of the retina (part of the eyeball) or injury to the optic nerve, among other causes. Distortions in the cornea, the lens of the eyeball, (cataracts) also can cause partial color blindness.
Rods and cones are inside a layer of the eyeball called the retina.
The gel that is inside the eyeball is called "vitreous humour".
One reason could be the increased amount of sunlight inducing the brown color in the sclera.
The white of the eye is called the Sclera.
Sclera
The eyeball is a directional adjustable fitting on the water return on your pool wall. Its called that as it looks like an eyeball.