Question

Given an account of the retina of the human eye.

Answer 1

Hint: The retina is the part of the eye that receives the light and converts it into chemical energy. The chemical energy activates nerves that conduct the message from the eye into the brain. The retina is a complex nervous structure. It is located near the optic nerve.

Complete answer: The retina is a thin layer of tissue that lines the back of the eye on the inside of the eyeball. The main function of the retina is to receive light that the lens has focused on and then convert that light into neural signals, and send these signals to the brain for visual recognition. The human retina consists of nearly 7,000,000 cones and 75,000,000 to 150,000,000 rods. The retina contains a layer of photoreceptor cells. These cells are light-sensitive cells that help in the detection of qualities like color and light intensity. The retina helps in processing the information which is gathered by the photoreceptor cells and sends this information to the brain through the optic nerve. The retina plays a vital role in vision. If it is damaged then it can cause permanent blindness. In retinal detachment, the retina is abnormally detached from its usual position in the eyeball which prevents the retina from receiving light and processing it. This prevents the brain from receiving this information which leads to blindness. Symptoms of retinal damage: dim vision, blurring of vision, flashes of light, peripheral shadows, shadows in the edges of the eyes, black spots, distorted shapes, and etc.

Note: Retinal detachment occurs when the retina pulls away from the back of the eye and the blood supply. Without a blood supply, the cells in the retina will die. This can cause permanent damage to your vision. If the macula (central vision area) begins to loosen, your vision may be permanently damaged.