Cataracts are cloudy areas in the eye’s lens causing blurred or hazy vision. Some cataracts stay small and don’t change your eyesight a lot. Others become large and reduce vision. Cataract surgery can restore good vision. It is a safe and common treatment. If you have a cataract, your eye care professional will watch for changes over time to see if you would benefit from surgery.
Corneal diseases and conditions can cause redness, watery eyes, pain, problems with vision, or a halo effect of the vision (things appear to have an aura of light around them). Infection and injury are some of the things that can hurt the cornea. Some problems with the cornea are more common in older people. Treatment may be simple—for example, changing your eyeglass prescription or using eye drops. In severe cases, surgery may be needed.
Information Courtesy of National Institute of Health