What is a Retina?
The retina is the nerve layer that lines the back of the eye. If you think of the eye as a camera, the retina is the film in the camera. A clear gel called the vitreous, located just in front of the retina, fills up the inside cavity of the eye. As one ages, the vitreous gel contracts and liquefies. As this occurs, the vitreous gel may sometimes pull a tear in the retina. Fluid from inside the eye can leak through the tear, and the retina can separate from the back wall of the eye, creating a retinal detachment.
What Causes a Detached Retina in the eye?
Retinal detachments occur with a frequency of 1 per 10,000 people per year. It is a serious condition that may lead to blindness if not treated appropriately. Risk factors for retinal detachment include nearsightedness (myopia), history of cataract surgery, family history of retinal detachment, retinal detachment in the other eye, and weak areas in the retina such as lattice degeneration.
What are Floaters?
Floaters are a typical part of aging, but they can also signal a possible case of retinal detachment. As their name implies, floaters appear to float around in front of your field of vision. They look like wavy lines, dots, circles, small specks, or even cobwebs. It appears they are at the front of the eye and you are seeing through them, but what you are seeing is actually the shadow cast on the retina by the floaters. Floaters are tiny clumps of gel or cells inside the vitreous, a clear gel-like substance that fills the eye. Because the retina, which interprets the images that enter the eye through the cornea, is at the back of the eye, light comes into the eye and floaters cast shadows onto the retina. They are most evident when you’re looking at a plain background such as a clear blue sky, a white wall, or a blank computer screen. Floaters aren’t usually seen in darker light conditions.
Floaters form with aging, as the vitreous starts to liquefy and possibly shrink. This can lead to the formation of clumps and strands — floaters — and it can make the vitreous pull away from the back of the eye. This is called posterior vitreous detachment, and it usually leads to the development of floaters. This vitreous detachment is not usually serious.
However, if the vitreous detachment pulls on the retina, it can create a tear in the retina and can lead to retinal detachment. This can create new floaters, especially small spots. A sudden increase in floaters can be a sign of retinal detachment.
What are Flashes?
Unlike floaters, flashes are fleeting. They look like flashing lights or lightning streaks in your field of vision. Flashes occur as the vitreous shrinks. This causes it to pull on the retina, which creates mechanical stimulation on the retina resulting in the flashes. Like floaters, seeing flashes occasionally is more common as we pass middle age. A sudden increase in flashes, as with a sudden increase with floaters, can be a sign of retinal detachment.
Are Migraines a Part of These Flashes?
Migraine headaches can also cause flashes. These flashes look more like jagged lines or heat waves, and they can last up to 20 minutes. They can occur in one or both eyes. Often a headache will accompany these flashes, but if there is no headache to accompany the flashes, this is known as an ophthalmic migraine.
Do Flashes and Floaters Go Away?
Floaters often go away at some point after they develop. They may change or pale if the clumps shift. The brain generally gets used to floaters, however, and basically ignores them when presenting images we see.
Flashes are temporary, caused by rubbing or pulling of the vitreous.
Do Floaters or Flashes Require Treatment?
Floaters and flashes are usually just nuisances and are not serious. In the majority of cases they do not require any treatment. However, there are times when they point to a serious condition — a torn or detached retina. If you have these symptoms, you need to call the team at VitreoRetinal Surgery immediately:
- You notice many new floaters
- You have lots of flashes
- A shadow appears in your peripheral vision
- A grey curtain covers part of your vision
Retinal Detachment Symptoms
Symptoms of a retinal detachment include the onset of floaters, flashing lights, and a “curtain” or area of darkness that may encroach on vision from the side. There is no pain with retinal detachment. You should contact your eye doctor as soon as possible if any of these symptoms develop.
How Can a Detached Retina be Repaired?
Retinal detachment repair brings the retina back into position and then sealing the hole or tear in the retina. Retinal detachment is almost always treated with some form of surgery. If the detachment is not extensive, laser treatment or cryotherapy (freezing) in the office are options. A procedure called pneumatic retinopexy treats some detachments. This involves the injection of air or gas into the eye in conjunction with laser or cryo. Doctors provide patients with specific head position instructions which allow the bubble to float up against the retina and keep it in position as it heals. Pneumatic retinopexy is only suitable for a select group of retinal detachments.
One of the most common surgical techniques in retinal detachment repair is a scleral buckle procedure. This is an operating room procedure in which a silicone band is placed around the eye. The band changes the shape of the eye and brings the retina back into contact with the wall of the eye. Then, cryo or lasers treat around the retinal breaks and other weak areas.
Vitrectomy surgery also has a role in retinal detachment repair. This technique removes the vitreous gel and any scar tissue from the eye. After the retina reattachment, a gas bubble fills the vitreous cavity to help hold the retina in position. The bubble generally lasts in the eye for several weeks and is gradually absorbed by the body. A silicone oil bubble is an alternative to an oil bubble in more complex cases. Once the retinal tissues are stable, a second surgery removes the silicone oil because it does not dissolve on its own.
Retinal Detachment Surgery
Surgery for most retinal detachments takes about one hour and local anesthesia is an option. Although hospital admission is not necessary, your surgeon may give you specific instructions regarding head positioning in order to maximize the chances of a successful outcome. Surgeries involving gas bubbles usually include limitations on flying in an airplane or traveling to high altitudes. Also, if you need surgery for any other reason while a gas bubble is in the eye, it is important to notify the anesthesiologist to prevent the gas bubble from expanding in the eye.
Retinal Detachment Surgery Results
The visual results of retinal reattachment depend on three main factors: how long the retina has been detached, how much of the retina has been detached and most importantly, whether the center of vision has been involved. If the surgery does not involve the center of vision, nearly full visual recovery is more likely. If the surgery does involve the center of vision, there is usually some permanent loss of vision. Your prescription for glasses may also need adjustments as a result of the surgery.
Schedule a Consultation
If you are interested in learning more about Retinal Detachment, please call (800) VRS-2500 to schedule a consultation. We have locations in Minneapolis, St. Paul, Blaine, Edina, Oakdale, Plymouth, St. Cloud and Duluth.