Retinal Diseases
Retinal diseases vary widely, but most of them cause visual symptoms. Retinal diseases can affect any part of your retina, a thin layer of tissue on the inside back wall of the eye.
The retina contains millions of light-sensitive cells, called rods and cones, and other nerve cells that receive and organize visual information. The retina sends this information to the brain through the optic nerve, enabling you to see.
Treatment is available for some retinal diseases. Depending on your condition, treatment goals may be to stop or slow the disease. This may help preserve, improve or restore your vision. Untreated, some retinal diseases can cause severe vision loss or blindness.
Types
Common retinal diseases and conditions include:
- Retinal tear. A retinal tear occurs when the clear, gel-like substance in the center of your eye, called vitreous, shrinks and tugs on the thin layer of tissue lining the back of your eye, called the retina. This can cause a tear in the retinal tissue. It’s often accompanied by the sudden onset of symptoms such as floaters and flashing lights.
- Retinal detachment. A retinal detachment is defined by the presence of fluid under the retina. This usually occurs when fluid passes through a retinal tear, causing the retina to lift away from the underlying tissue layers.
- Diabetic retinopathy. If you have diabetes, the tiny blood vessels in the back of your eye can deteriorate and leak fluid into and under the retina. This causes the retina to swell, which may blur or distort your vision. Or you may develop new, irregular capillaries that break and bleed. This also worsens your vision.
- Epiretinal membrane. Epiretinal membrane is a delicate tissue-like scar or membrane that looks like crinkled cellophane lying on top of the retina. This membrane pulls up on the retina, which distorts your vision. Objects may appear blurred or crooked.
- Macular hole. A macular hole is a small defect in the center of the retina at the back of the eye, called the macula. The hole may develop from atypical traction between the retina and the vitreous, or it may follow an injury to the eye.
- Macular degeneration. In macular degeneration, the center of the retina begins to deteriorate. This causes symptoms such as blurred central vision or a blind spot in the center of the visual field. There are two types — wet macular degeneration and dry macular degeneration. Many people will first have the dry form, which can progress to the wet form in one or both eyes.
- Retinitis pigmentosa. Retinitis pigmentosa is an inherited degenerative disease. It slowly affects the retina and causes loss of night and side vision.