Optic part of retina

The optic part of retina is the posterior, photosensitive region of the retina responsible for vision. It extends from the ora serrata anteriorly to the optic disc posteriorly, where retinal nerve fibers converge to form the optic nerve. Unlike the nonvisual parts of the retina, this region is specialized for photoreception and neural processing of visual information.

Histological architecture

Histologically, the optic part of retina is a multi-layered neural structure. It consists of ten distinct layers, which (from outer to inner) include:

• Retinal pigment epithelium (RPE),

• Photoreceptor layer (rods and cones),

• External limiting membrane,

• Outer nuclear layer,

• Outer plexiform layer,

• Inner nuclear layer,

• Inner plexiform layer,

• Ganglion cell layer,

• Nerve fibre layer, and

• Internal limiting membrane.

Phototransduction

The photoreceptors (rods and cones) are the key sensory cells that convert light into electrical signals. These are transmitted through bipolar cells to ganglion cells. The axons of ganglion cells form the optic nerve, which carries visual information to the brain.

Clinical correlate

Clinically, the optic retina is critically important, as it is involved in conditions such as retinal detachment (separation of the neural retina from the RPE),