Naczyniówki

Naczyniówki, also known as the choroid, is the vascular layer of the eye, situated between the retina and the sclera. It is one of the three main layers that make up the eyeball. The choroid is rich in blood vessels, which are essential for nourishing the outer layers of the retina, including the photoreceptor cells. These cells, responsible for detecting light and color, have high metabolic demands, and the choroid's dense capillary network ensures they receive a constant supply of oxygen and nutrients.

The choroid's pigmentation, primarily due to melanin, helps to absorb scattered light within the eye. This absorption prevents light from reflecting off the inner surfaces of the eye and interfering with the clear formation of images on the retina. Without this light-absorbing function, vision would be blurred.

In humans, the choroid extends from the optic nerve to the ciliary body. It is a thin layer, typically only about 0.2 millimeters thick in its posterior part. Diseases affecting the choroid can have significant impacts on vision, as disruptions to its blood supply or structure can impair retinal function. Conditions like choroiditis, an inflammation of the choroid, or age-related macular degeneration, which can affect the choroid's blood vessels, are examples of pathologies that can compromise vision.