What is a primary complication of Vitamin A deficiency on vision?

Vitamin A plays a crucial role in the function of the retina and is essential for the production of rhodopsin, a light-sensitive protein found in the rods of the retina that is necessary for vision in low-light conditions. A deficiency in vitamin A can lead to a condition known as nyctalopia, or night blindness, which is characterized by difficulty seeing in low-light environments. This happens because without sufficient vitamin A, the formation of rhodopsin is impaired, leading to compromised vision when transitioning from bright to dim light.

While tunnel vision, photophobia, and complete blindness can occur in various ocular conditions, they are not directly attributable to vitamin A deficiency in the same way that nyctalopia is. Tunnel vision typically involves the loss of peripheral vision and is associated with conditions affecting the optic nerve or retinal pathways, photophobia refers to sensitivity to bright light, which can occur for various reasons including inflammation or irritation of the eye, and blindness can result from multiple causes, including severe, uncorrectable damage to the retina or optic nerve, or diseases such as glaucoma or cataracts.

Therefore, the primary complication of vitamin A deficiency on vision is nyctalopia, which specifically relates to the inability to see well in low-light conditions due to the