Night blindness is a nutritional defect in which person is not able to see in dim or low light. It is caused by deficiency of vitamin A.^_^

Deficiency of Vitamin A causes night blindness:

Night blindness is a condition in which a person is unable to see clearly in low light or darkness. This condition is caused by the deficiency of Vitamin A in the body. Vitamin A is essential for the proper functioning of the retina, which is the part of the eye that detects light.

Vitamin A and Retinol:

Vitamin A is also known as retinol, and it is found in animal-based foods such as eggs, liver, and dairy products. It is also found in plant-based foods such as carrots, sweet potatoes, and spinach. The body converts beta-carotene, a pigment found in these plant-based foods, into Vitamin A.

The role of Vitamin A:

Vitamin A is essential for maintaining healthy eyesight, especially in low light conditions. It helps to maintain the health of the cornea, which is the outermost layer of the eye. It also helps to form the pigments that allow the retina to detect light.

Symptoms of Night Blindness:

The symptoms of night blindness include difficulty seeing in dim light or darkness, slow adjustment to changes in light, and increased sensitivity to glare.

Prevention and Treatment:

Night blindness can be prevented and treated by increasing the intake of Vitamin A in the diet. Foods rich in Vitamin A include liver, egg yolks, butter, whole milk, and cod liver oil. Vitamin A supplements can also be taken under medical supervision.

Conclusion:

In conclusion, Vitamin A deficiency is the main cause of night blindness. It is essential to maintain a healthy diet that includes foods rich in Vitamin A to prevent and treat night blindness.