How do opticians test eyes

Cataracts

The lens of your eye is located right behind your pupil and, as you age, the cells grow and die inside it. This builds up the amount of debris and causes cataracts. These won’t cause you pain, but will slowly cloud your eye lens causing sight difficulty. One of the first and most common symptoms is decreased night vision. This is due to cataracts distorting the light that comes through your eyes. In addition to difficulty with night vision, you may also experience blurry vision or see halos around lights.

Lack of vitamins

Bad night vision could indicate a lack of vitamin A or low zinc levels. You need vitamin A to help keep the retina healthy. An increase in carrots and leafy greens could improve your situation. You also need zinc in your diet as it helps vitamin A work. You can find zinc in beef, beans, and poultry. The most common symptom of low zinc levels is night blindness.