The uvea being the iris, the ciliary body and the choroid. Those are the three parts of the eye that belong to the uvea. The slide on the right here is supposed to show what we see when we look at a slit-lamp. A slit-lamp being a biomicroscope that allows us to examine the eye. When we look at the anterior chamber we project a beam from the front of the eye back Cataracts.
Cataracts are very common.
A cataract is when the lens inside the eye turns cloudy. A white pupil. Of course, light trying to pass through that lens is going to be relatively blocked. As you can see on the slide on the right, if someone were able to see the Snellen chart clearly they would see it as you see it on the left. Now with a cataract, you would see it as this projects on the right, very blurred.