What are those grey spots on my eyeball?

Probably normal: Grey spots on the sclera (white of the eye) are usually areas of thinning of the eye wall, which is common with age. This thinning allows the pigmented tissues beneath the sclera to show through, which gives this grey appearance. However, areas of increased pigmentation (usually brown or black) can indicate a risk for cancer or pre-cancer on the surface of the eye, so get an eye exam to be sure.