Eye is made up of Iris, Pupil, Cornea and Retina. The retina is an extremely thin tissue that lines the inside of the back of the eye. It is the light-sensitive portion of the eye. Light from the objects we are looking at, enters the eye. Cornea and the eye lens focus the light image onto the retina. Human eye works like a camera, light striking the retina causes a complex biochemical change within certain layers of the retina and this, in turn, stimulates an electrical response within other layers of the retina.
These electric signals are transmitted by the nerve endings to the brain through optic nerve, which connects the eye to the brain. Within specific areas of the brain, this electrical energy is received and processed to allow us both to see and to understand what we are seeing. The retina has been compared to the film of a camera. However, once used, film has a permanent image on it. The neurosensory retina, in contrast, continually renews itself chemically and electrically, allowing us to see millions of different images every day without them being superimposed.
The retina is about the size of a postage stamp. It consists of a central area called the macula and a much larger peripheral area of the retina. The light receptor cells within the retina are of two types called the cones and the rods. Cones are concentrated within the macular (central) area and provide us with the sharpness of central vision and color vision. Rods predominate in the peripheral area of the retina and allow us to see in conditions of reduced illumination. The peripheral retina allows us to see objects on either side (peripheral vision) and, therefore, provides the vision needed for a person to move about safely.
Retinal detachment occurs when the retina becomes separated from the nerve tissues and blood supply underneath it. While painless, visually this has a clouding effect that has been likened to a gray curtain moving across the field of vision.
There are 3 types of detachment: rhegmatogenous (which involves a retinal break), traction, and serous (exudative) detachment. Traction and serous retinal detachments do not involve a break and are called nonrhegmatogenous.
Rhegmatogenous detachment is the most common type and caused by a tear or hole in the retina. Risk factors include the following:
Traction retinal detachment can be caused by vitreoretinal traction due to preretinal fibrous membranes as may occur in proliferative diabetic or sickle cell retinopathy.
Serous detachment results from transudation of fluid into the subretinal space. Causes include severe uveitis, especially in Vogt-Koyanagi-Harada disease, choroidal hemangiomas, and primary or metastatic choroidal cancers (see Cancers Affecting the Retina).
A person with a detached retina may experience a number of symptoms.
These include:
Your doctor may use the following tests, instruments and procedures to diagnose retinal detachment:
The goal of treatment is to re-attach the retina to the back wall of the eye and seal the tears or holes that caused the retinal detachment. Several approaches can be employed to repair a retinal detachment:
Like any other surgery, retinal detachment procedures can also be followed by complications like:
Important Reminder: This information is only intended to provide guidance, not a definitive medical advice. Please consult eye doctor about your specific condition. Only a trained, experienced board certified eye doctor can determine an accurate diagnosis and proper treatment.
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