What is the consequence of having a vitamin A deficiency leading to total blindness?

Vitamin A plays a crucial role in maintaining healthy vision, particularly by supporting the function of the retina, where photoreceptors rely on vitamin A to convert light into neural signals. A deficiency in vitamin A can lead to a condition known as xerophthalmia, which is characterized by dryness and damage to the cornea. This damage can progress to more severe issues, including changes in the corneal structure that can result in total blindness.

Corneal health is essential for clear vision, as it is the transparent front part of the eye that refracts light to enter the eye. When vitamin A levels are insufficient, the cornea becomes dry and can sustain permanent damage, leading to blindness if not addressed. Therefore, the connection between vitamin A deficiency and corneal affection is pivotal in understanding the consequences on vision health.