What is the epithelium of the retina pigment?

The epithelium of the retinal pigment, or RPE, is the only layer of cells in the eye, lying between the retina and the choroid, which is a vascular layer on the back of the eye. This epithelium consists of cells that are dark colors, usually dark brown in humans. The cells have a hexagonal shape and are arranged in the mono -layer to form a layer of only one cell in the thickness. Each cell is firmly connected to the retina at the front and the choroid at the rear. Each cell has an outer part that is clear, and the inner part, which is densely filled with pigment granules, giving the epithelium its dark look.

The main function of the retinal pigment epithelium is assumed that it is related to the nutrition of the eye, especially the retina and maintaining the delicate environment for the non -healing vision. As an organ, the retina has a very active metabolism. New nerves and photoreceptors or light sensitive cells are constantly forming and destroying. Tje's activity results in a significant amount of water, which could lead to a catastrophic increase in the eye pressure.

The

Pigment retinal epithelium is used to transport excess water, along with other waste molecules, from the retina and from the rear of the eye to be kidnapped by the blood supply. Epithelial cells also supply retinal cells with basic nutrient molecules, including amino acids, glucose and vitamin C.

Another protective function of the epithelium of the retina pigment is the absorption of light. Excessive light entering the eye can damage the sensitive cells of the retina. Pigment of epithelial cells has a complex composition that allows it to absorb a wide range of different light waves.

As people get older, the eye aging process often affects the ability of the retina pigment to perform this function of protective light absorption. This can lead to gradual degradation of the retina and lead to poor eyesight. Another RPE -related disorder is the retinal pigment epithelial hypertrophy that occurs when the epithelium area intensifies than usual. This can happen with an oldI force or may be innate, ie present from birth.