What is the choroid layer in the eye?

What is the choroid layer in the eye?

A thin layer of tissue that is part of the middle layer of the wall of the eye, between the sclera (white outer layer of the eye) and the retina (the inner layer of nerve tissue at the back of the eye). The choriod is filled with blood vessels that bring oxygen and nutrients to the eye.

What is the choroid composed of?

The choroid is comprised of blood vessels, melanocytes, fibroblasts, resident immunocompetent cells and supporting collagenous and elastic connective tissue.

What are the 4 layers of the eye?

The four layers of the sclera from external to internal are episclera, stroma, lamina fusca, endothelium. The episclera is the external surface of the sclera.

What is the function of the choroid layer?

The choroid is a vascular bed that supplies nutrients and oxygen to the RPE and outer nuclear layer of the retina. It consists of larger vessels and a highly fenestrated capillary bed known as the choriocapillaris.

What is fibrous tunic?

The fibrous tunic is composed of the sclera and the cornea. The sclera covers nearly the entire surface of the eyeball. With its external surface being white-coloured, it is commonly known as the “white of the eye”. The transparent cornea occupies the front center part of the external tunic.

What color is the choroid layer?

The dark-colored melanin pigment in the choroid absorbs light and limits reflections within the eye that could degrade vision. 1 The melanin is also thought to protect the choroidal blood vessels against light toxicity. The choroidal pigment is what causes “red eyes” when flash photographs are taken.

What Colour is the choroid?

It is a thin, highly vascular (i.e. it contains blood vessels) membrane that is dark brown in colour and contains a pigment that absorbs excess light and so prevents blurred vision (due to too much light on the retina). The choroid is loosely attached to the inner surface of the sclera by the lamina fusa.

What is the first layer of your eye called?

The clear front of your eye is called the cornea. This transparent disc sits over the pupil and iris, protecting them and letting in light. It is highly sensitive. The cornea also forms the first part of the process of focusing what you look at into an image on the back of your eye (see below).