Cataracts: Cataracts are a common aging change to the eye’s natural lens. As we age, protein is deposited in the lens making it progressively opaque. This process takes years before symptoms develop; symptomatic cataracts are most common after the age of 65. As the lens ages it becomes discolored and cloudy resulting in dim, hazy vision. Many people with cataracts complain about blurred vision , needing more light to read and trouble driving at night due to glare and halos. Initially, the symptoms of cataracts are mild, and no treatment is necessary. As the cataract progresses and the symptoms worsen there comes a point in time when cataract surgery is necessary to restore vision. Here is another interesting article about cataracts from the American academy of ophthalmology.
https://www.aao.org/eye-health/diseases/what-is-cataract-surgery