Question

The internal layer of the eye which prevents reflection of light is known as _____

Answer 1

The internal structure of eye starts after sclera and iris. At times when light hits a thing, it reflects. So as for the reflection to occur, the surface has to be polished and silky. The internal layer of the eye is rich in blood supply and is called pigment layer.

Complete answer:
In order to answer the question, we will have to understand the inner structure of the eye.

Choroid: It is a “Black-pigmented” coat underneath the sclera, which avoids the reflection of light. It has blood capillaries and blood vessels that bring oxygen and nutrients to nourish the eye. Formation of Iris and the ciliary body occurs by alteration of choroid.
The melanin pigment present in the choroid absorbs light. It also restricts reflection in the eye which might damage vision.

Aqueous humour: It is usually a fluid that seals the area amidst the cornea and the lens. It provides nutrients for sustenance and also regulates convex shape of the cornea along with refracting light onto the pupil.

Vitreous humour: It is gelatinous material that forms the main part of the eye. It bends light on the retina.

Lens: Lens is an elastic, crystal clear, biconvex arrangement. It focuses light on the retina.

Suspensory Ligament: It is a tissue that links the lens with the ciliary body. It helps to keep the Lens intact.

Ciliary body: It is a curved group of tissues in front of the choroid. It has ciliary muscles, which look after the curve structure of the lens.

Retina: Retina is light sensitive and the internal-most layer of the eye. They contain photoreceptors which are light-sensitive cells

Optic nerves: It is located behind the eye. Impulses from photoreceptors to the brain are transferred by these nerves.

Photoreceptors: Rods sense light in faint light (black and white) allowing night visualization. They have a pigment known as rhodopsin which is light sensitive. Rhodopsin allows one to see at night.
Cones sense highlighted light. Red responds to longer wavelength, blue responds to shorter wavelength, and green responds to mediocre length. Cones allow the awareness of particulars, however cannot do fine in less light.

Blind spot: It is a spot in the retina where optic nerves leave the eye. It is not sensitive to light.

Hence, the internal layer of the eye which prevents reflection of light is known as Choroid.

Additional information:
The below-mentioned layers lie horizontally beside each other and together form the eye.
- The outermost layer of the eye is a tough, white, opaque film, also known as the sclera.
- The middle layer is the choroid.
- The internal-most layer is the retina.

Note: Choroid is also called as the choroid coat or the pigment layer. It is a vascular layer of the eye which contains connective tissues. It provides nourishment and oxygen to the outer layer of the retina. In our eyes it accounts for about $85^\circ$ of total blood flow.