Rheumatoid arthritis can cause the eyeball becomes inflamed, which leads to the lens becoming cloudy and forming a "cataract." This is when the lens, which is normally clear, becomes milky instead. Therefore, blurry vision follows, and colors often look as if they are faded.
Normally the treatment for cataracts is surgery. The surgery consists of the removal of the damaged lens, and replacing it with an artificial clear lens. People normally report dramatic improvement to their eyesight afterwards, especially those in old age who have been suffering from cataracts for a long period of time.