Retinal Tears and Retinal Detachment
What is the retina?
The retina is the thin layer of light-sensing nerve cells lining the inside back of your eye. It converts light rays into signals, which are sent through the optic nerve to your brain where they are recognized as images.
An eye is like a camera. The cornea and lens in the front of the eye focuses light onto the retina. You can think of the retina as a layer that lines the back of a film camera.
What is a retinal detachment?
A retinal detachment occurs when the retina is pulled away from its normal position of lining the inside eyewall. The retina does not work when it is detached. Vision is blurred, just as a photographic image would be blurry if the film were loose inside the camera.
A retinal detachment is a very serious problem that almost always causes irreversible blindness unless it is treated.
What causes retinal detachment?
A clear gel called vitreous (vit-ree-us) fills the middle of the eye. As we get older, the vitreous may pull away from its attachment to the retina at the back of the eye.
Usually the vitreous separates from the retina without causing problems. But sometimes the vitreous pulls hard enough to tear the retina in one or more places. Fluid may pass through the retina tear. As fluid accumulates between the retina and the eye wall, the retina lifts off the eye wall, much as wallpaper can peel off a wall.
The following conditions increase the chance of having a retina detachment:
- Previous cataract surgery
- Severe injury
- Previous retinal detachment in your other eye
- Family history of retinal detachment
- Weak areas in your retina that can be seen by your ophthalmologist (Eye MD)
What are the warning symptoms of retina detachment?
These early symptoms may indicate the presence of a retinal detachment:
- Flashing lights
- New floaters
- A shadow in the periphery (side) of your field of vision
- A gray curtain moving across your field of vision
These symptoms do not always mean a retinal detachment is present; however, you should see your ophthalmologist as soon as possible.
Your ophthalmologist can diagnose retinal detachment during an eye examination and will dilate (enlarge) the pupils of your eyes. Some retinal detachments are found during a routine eye examination.
Only after careful examination can your ophthalmologist tell whether a retinal tear or early retinal detachment is present.
What treatment is needed?
Most retinal tears need to be treated with a laser surgery or cryotherapy (freezing), which seals the retina to the back wall of the eye.
These treatments cause little or no discomfort and may be performed in your ophthalmologist’s office. Treatment usually prevents retinal detachment.
Almost all patients with retinal detachments require surgery to return the retina to its proper position.
Types of Surgery
There are several ways to fix a retinal detachment. The decision about which type of surgery and anesthesia (local or general) to use depends upon the characteristics of your detachment.
In each of the following methods, your retina specialist will locate the retinal tears and use laser surgery or cryotherapy to seal the tear.
This surgery is performed in an operating room. The vitreous gel, which is pulling on the retina, is removed from the eye and usually replaced with a gas bubble. Any retinal tear is then treated laser or cryotherapy. The gas bubble holds the retina in place as it heals against the eye wall. Your eye’s fluid will gradually replace the gas bubble. Your retina specialist will ask you to maintain a certain head position for several days. The gas bubble will gradually disappear.
Sometimes vitrectomy is combined with a scleral buckle.
This treatment involves placing a flexible band (scleral buckle) around the eye to counteract the force pulling the retina out of place. Placing a scleral buckle resembles putting on a belt around the waist. The retina specialist often drains the fluid under the detached retina, allowing the retina to settle back into its normal position against the back wall of the eye. The procedure is performed in an operating room.
In this procedure, a gas bubble is injected into the vitreous space inside the eye in combination with laser surgery or cryotherapy. The gas bubble pushes the retinal tear closed against the back wall of the eye. Sometimes this procedure can be done in the retina specialist’s office. Your retina specialist will ask you to maintain a certain head position for several days. The gas bubble will gradually disappear.
You can expect some discomfort after surgery. Your ophthalmologist will prescribe any necessary medications for you and advise you when to resume normal activity. You will need to wear an eye patch for a short time.
Flashing lights and floaters may continue for while after surgery.
If a gas bubble was place in your eye, your ophthalmologist may recommend that you keep your head in special positions for a time.
Do not fly in an airplane or travel at high altitudes until you are told the gas bubble is gone. A rapid increase in altitude can cause a dangerous rise in eye pressure.
A change of eyeglasses is often helpful after several months.
What are the risks of surgery?
Any surgery has risks; however, an untreated retinal detachment usually results in permanent, severe vision loss or blindness.
Some of the surgical risks include:
- High or low pressure in the eye
- Excessive scar tissue formation
Most retina detachment surgery is successful, although a second operation is sometimes needed.
Some retinal detachments cannot be fixed. If the retina cannot be reattached, the eye will continue to lose sight and ultimately become blind.
Will your vision improve?
After successful surgery, vision may take many months to improve and in some cases may never return fully. Unfortunately, some patients do not recover any vision.
The more severe the detachment, the less vision may return. For this reason, it is very important to see your ophthalmologist at the first sign of any trouble.