Cataracts cause progressively blurred, dimmed vision, making it difficult to see clearly while driving and reading, according to Mayo Clinic. Night vision is increasingly impaired, and individuals may suffer from double vision, glare and sensitivity to light. Colors often look faded, and lights may appear to be surrounded by halos.
A cataract clouds the lens of the eye, interfering with the eye's ability to guide light toward the retina, the National Eye Institute states. The condition weakens image perception and makes lights seem brighter than usual. Cataracts often cause people with glasses or contacts to need frequent prescription changes. They are a common symptom of aging, but individuals of any age can develop cataracts from injuries, radiation exposure and disease, such as glaucoma.