The internal layer of the eye is made of the retina. The retina is a nerve tissue consisting of photoreceptor cells that transform absorbed light into electrical nerve impulses.
Retina
The retina is the sensory part of the eye. It is the deepest layer of the eye.
It can be divided into two divisions:
- Retinal pigment epithelium
- Neural retina
Retinal pigment epithelium
The outer layer, which is attached to the choroid -- the choriocapillary layer, through Bruch's membrane. The cells are connected via a gap and tight junctions.
The functions of the retinal pigment epithelium are quite diverse:
- Form the blood-retinal barrier via the tight junctions
- Help the visual function of the photoreceptors
- Maintains the photoreceptors by phagocytosis of waste
- Absorbs the light passing through the retina and prevents reflection