Night vision problems can be caused by chronic diseases, such as diabetes. People with diabetes often experience nerve damage, which can affect the retina and lead to night blindness. Problems specific to the eye can also cause night vision problems. For example, the first sign of cataracts is often declining night vision. Glaucoma is increased pressure in the eye and may also cause this problem. Complications of LASIK surgery can cause problems with night vision.
Treatment for night vision problems depends upon the cause. Cataracts can be treated with surgery, and vitamin A and zinc deficiencies can easily be corrected with diet or supplements. If night blindness is caused by diabetes, tight blood sugar control may lead to improvement. For patients who have night vision problems caused by untreated myopia, corrective lenses may correct the problem.
Source: http://valerie-dansereau.suite101.com/night-blindness-causes-and-treatment-of-decreased-night-vision-a248445
