Definition of Vision - night blindness:

Night blindness is poor vision at night or in dim light.

Considerations:

Night blindness may cause problems with driving at night. People with night blindness often have trouble seeing stars on a clear night or walking through a dark room, such as a movie theater.

These problems are often worse just after a person is in a brightly lit environment. Milder cases may just have a harder time adapting to darkness.

Common Causes:

The causes of night blindness fall into two categories: treatable and nontreatable.

Treatable causes:

• Cataracts
• Nearsightedness
• Use of certain drugs
• Vitamin A deficiency (rare)

Nontreatable causes:

• Birth defects
• Retinitis pigmentosa