What is posterior eye segment?

The posterior eye segment is the back portion of the eye that contains the retina, optic nerve, choroid, and vitreous humor. It is the region where light is converted into neural signals and transmitted to the brain to create a visual image. The retina is a thin layer of tissue that lines the back of the eye and contains light-sensitive cells called photoreceptors. These photoreceptors convert light into electrical signals which are transmitted to the brain via the optic nerve. The choroid is a network of blood vessels that provides nutrition to the retina and prevents the scattering of light. The vitreous humor is a gel-like substance that fills the space between the lens and the retina and provides support to the eye. The posterior segment of the eye is crucial for vision and any damage to this region can result in vision loss or blindness.