How can ocular rosacea affect vision?

Rosacea is a skin disease that causes redness and sometimes pustules on the skin usually of the face and neck. Some have called rosacea "adult acne." There are various degrees of rosacea such that many patients have a very mild form that surprisingly causes eye problems with almost no skin troubles.
Ocular Rosacea is skin rosacea around the eyes that causes problems on the surface of the eyes. Often the eyes are red, inflamed, photophobic and irritated with foreign body sensation. This is caused by direct inflammation in the cornea or toxic irritation of the surface of the cornea. Rosacea can even cause a perforation of the cornea which can require emergency treatment. Anything that causes irritation of the fine smooth surface of the cornea can distort and reduce vision. Generally the inside of the eye is not bothered by rosacea. Treatment of ocular rosacea is similar to skin rosacea. As the skin improves so do the eye(s).

Some people with ocular rosacea report blurred vision as well as light sensitivity. Eyes may also become swollen, may sting or burn, may be dry and itchy, or may develop styes. Left untreated, ocular rosacea could damage the cornea of the eye, leading to vision loss.