Visual System and Eyesight

Located at the back of the eye, the retina contains two main types of light-sensitive receptor cells − known as rod and cone photoreceptor cells. Photons (particles of light) that pass through the lens are sensed by the photoreceptor cells of the retina and converted...

Age-related Macular Degeneration

In Western countries, degeneration of the macula, the center of the eye’s retina, is a leading cause of blindness in older adults. Long-term blue light exposure and oxidative damage in the outer segments of photoreceptors may lead to drusen and/or pigment...

What Are Some Vitamin A Food Sources?

Food sources “Free retinol is not generally found in food. Retinyl esters (including retinyl palmitate) are the storage form of retinol in animals and thus the main precursors of retinol in food from animals. Plants contain carotenoids, some of which are...

Susceptibility To Infectious Diseases

Susceptibility to infectious diseases Infectious diseases have been associated with depletion of vitamin A hepatic reserves (already limited in vitamin A-deficient subjects), reduced serum retinol concentrations, and increased loss of vitamin A in the urine (37)....

Vitamin A Deficiency-Related Disorders

Disease of the eye and blindness This month we will look at a piece from the Linus Pauling Institute Micronutrient Information Center: “With an estimated 250,000 to 500,000 children becoming blind annually, vitamin A deficiency constitutes the leading...