Rabbits often develop a cloudy appearance to their eyes.  The eyes may become cloudy on the cornea (surface of the eye), the lenses, or any of the chambers inside.  There may be many different causes for this disorder ranging from a parasite, Encephalitozoon cunniculi, to a corneal scratch or ulcer, cataracts, or various infections.  A rabbit eye can quickly get damaged beyond repair so any time you see a change in an eye, a health consultation is a must.