Humans and other animals have many phenotypic variations in eye color. The genetics of eye color are complicated, and color is determined by multiple genes. So far, as many as 15 genes have been associated with eye color inheritance. Some of the eye-color genes include OCA2 and HERC2.
Answers (2). green. There are many reasons accounting for the fact that your eyes go out of focus and it is quite normal in the daily life. The tiredness of eyes can result in your difficulty in focusing on object. A migraine headache, as said by the ophthalmologist, can also cause the eye go out of focus.
What you are describing is probably conjunctival hyperemia. So, what would cause this when you wake up but not during the day when your eyes are open and blinking? The lack of oxygen/ocoular ischemia answer doesn't do it for me because, why would you only have a lack of oxygen to your eyes at night? Why not the rest of you?