cataract
Why do I have poor night vision?

Poor night vision is a common symptom of cataracts. Cataracts occur when the natural lens inside the eye becomes cloudy, most often as a result of age. When this happens, light cannot focus properly in the back of the eye, causing blurry vision. Any light placed behind the person is helpful, but turn those lights directly towards that person, such as car headlights, and they will experience major glare problems. This is why night-time driving is so hard for people with cataracts. It is comparable to when the bright sunshine hits a dirty windshield, visibility decreases drastically.

Cataracts usually are slow growing and take many years to mature enough to be removed. If you are having difficulty driving at night due to an increased amount of glare, a vision exam is recommended.