London: Eating oily fish twice in a week -- equivalent to 500 mg per day of dietary omega-3 polyunsaturated fatty acids -- can decrease the risk of sight-threatening diabetic retinopathy in middle-aged and older individuals with Type 2 diabetes, finds a study.

Diabetic retinopathy is a diabetes complication that affects eyes and has become a leading global cause of vision loss. It is caused by damage to the blood vessels of the light-sensitive tissue at the back of the eye (retina).