What is croup? Croup is a fairly common respiratory condition in children usually caused by a viral infection or allergic reaction. Croup affects the windpipe (trachea), the bronchi (airways to the lungs), and the larynx (voice box).
However, as the cataract continues to become denser, vision also becomes more cloudy, and stronger glasses or contact lenses will no longer improve sight. Cataracts typically develop gradually and are usually not painful or associated with any eye redness or other symptoms unless they become extremely advanced.
Now, cats can get congenital cataracts, but not so much the hereditary sort that dogs get. So, in cats, generally the eye is pretty upset and inflamed by the time the kitty develops a cataract. If the area where you are doing surgery is full of inflammation, the surgery will not go well.