Understanding Retina Diseases and Your Vision
What the Retina Does and Why It Matters
Think of the retina like the film in a camera. Light enters through the front of the eye, passes through the lens, and lands on the retina. Millions of specialized cells called photoreceptors detect this light. They send signals through the optic nerve to the brain, which assembles those signals into images.
The retina has two main types of photoreceptors. Rods help you see in dim light and detect motion in your side vision. Cones are concentrated in the center of the retina and handle color vision and fine detail.
The macula is a small but critical area at the center of the retina. It is responsible for your sharpest, most detailed vision. You use your macula when you read, drive, recognize faces, and see fine details. Many retinal diseases specifically target the macula, which is why central vision loss is a common symptom.
The retina has a limited ability to repair itself. Damage to retinal cells can lead to lasting vision changes if not caught early. The retina also depends on a healthy blood supply. Conditions that affect blood vessels, such as diabetes and high blood pressure, can directly harm the retina. Regular eye exams allow a retina specialist to detect problems before you notice symptoms.
Common Types of Retinal Diseases
Age-related macular degeneration (AMD) is one of the leading causes of vision loss in people over 50. It affects the macula and comes in two forms. Dry AMD involves a gradual breakdown of light-sensitive cells in the macula. Wet AMD occurs when abnormal blood vessels grow beneath the retina and leak fluid or blood.
Approximately 2.1 million Americans have advanced AMD, and that number is projected to reach 3.7 million by 2030 (NEI, 2014). Dry AMD is far more common, but wet AMD tends to cause more severe vision loss if left untreated.
Diabetic retinopathy develops when high blood sugar damages the tiny blood vessels in the retina. Over time, these vessels may leak fluid, swell, or close off entirely. In advanced stages, the eye grows new, fragile blood vessels that bleed easily. This condition is the leading cause of blindness in working-age adults.
The prevalence of diabetic retinopathy among diabetes patients in the United States increased from 13.6% in 2001 to 20.8% in 2021 (JAMA Ophthalmology, 2025). As diabetes rates continue to rise, more people are at risk.
Retinal vein occlusion (RVO) happens when a vein carrying blood away from the retina becomes blocked. This blockage causes blood and fluid to leak into the retina, leading to swelling and vision loss. High blood pressure, diabetes, and glaucoma are common risk factors. RVO can affect a small branch vein or the main central retinal vein.
Retinal detachment is a medical emergency. It occurs when the retina pulls away from the tissue beneath it that provides oxygen and nutrients. Without prompt treatment, a retinal detachment can lead to severe, irreversible vision loss. See a retina specialist or go to the emergency room immediately if you notice a sudden increase in floaters, flashes of light, or a shadow spreading across your vision.
Inherited retinal diseases (IRDs) are caused by genetic mutations that affect how photoreceptors develop or function. These conditions include retinitis pigmentosa, Stargardt disease, and Leber congenital amaurosis. IRDs have a prevalence of approximately 1 in 1,380 individuals, affecting about 5.5 million people worldwide (PMC, 2022). Symptoms often begin in childhood or young adulthood and may include night blindness or progressive vision loss.
Who Is Affected and Risk Factors
Several factors increase the risk of developing a retinal condition. Some cannot be changed, while others can be managed through lifestyle choices and medical care.
- Age, especially over 60
- Diabetes mellitus
- High blood pressure
- Family history of retinal disease
- High myopia (severe nearsightedness)
- Smoking
- Obesity and cardiovascular disease
- Previous eye surgery or eye trauma
Each retinal disease has its own set of risk factors. For AMD, the strongest risks are aging, smoking, family history, and having light-colored eyes. For diabetic retinopathy, the duration of diabetes and blood sugar control are the most important factors.
Retinal detachment is more common in people with high myopia or a condition called lattice degeneration (thinning areas in the peripheral retina). Inherited retinal diseases are linked to specific genetic mutations and tend to run in families.
Your overall health plays a major role in retinal health. Conditions like diabetes, high blood pressure, and high cholesterol can damage blood vessels throughout the body, including those in the retina. Managing these conditions with the help of your primary care doctor is one of the most effective ways to reduce your risk of retinal disease.
Signs and Symptoms to Watch For
Many retinal diseases develop slowly. Early stages may produce no noticeable symptoms. Over time, you might notice blurred vision, difficulty reading, or trouble seeing in low light. Straight lines may appear wavy or distorted, which is a hallmark sign of macular problems. Dark or empty spots may develop in your central vision.
Some retinal symptoms require immediate medical attention. See a retina specialist or go to the emergency room immediately if you experience any of the following:
- A sudden increase in floaters
- Flashes of light, especially in your side vision
- A shadow or curtain spreading across your visual field
- Sudden vision loss in one eye
These symptoms may indicate a retinal tear, retinal detachment, or other serious condition. Waiting even a few hours can affect whether vision can be saved.
Diabetic retinopathy may cause fluctuating vision that changes from day to day. AMD often begins with wavy or distorted central vision. Inherited retinal diseases commonly cause difficulty seeing at night or a gradual narrowing of side vision. Any new or changing visual symptoms deserve a thorough evaluation.
Diagnosis and Testing
A retina specialist can evaluate the health of your retina using a dilated eye exam. Drops are placed in the eyes to widen the pupils. This allows the specialist to view the retina with special instruments and lenses. The exam can reveal signs of disease that are not yet causing symptoms.
Modern imaging has transformed how retinal diseases are detected and monitored. Optical coherence tomography (OCT) uses light waves to create detailed cross-section images of the retina. This test can reveal swelling, fluid, or thinning that may not be visible during a standard exam.
Fluorescein angiography involves injecting a safe dye into a vein in the arm. The dye is then photographed as it travels through retinal blood vessels, highlighting areas of leakage or abnormal vessel growth. OCT angiography (OCTA) can map retinal blood vessels without dye injection.
For suspected inherited retinal diseases, genetic testing can identify the specific mutation responsible. Knowing the exact genetic cause is important because it may determine eligibility for gene therapy or clinical trials. A retina specialist can help coordinate genetic testing and counseling.
Artificial intelligence (AI) is increasingly used to screen for retinal diseases, particularly diabetic retinopathy. AI systems can analyze retinal photographs and flag signs of disease. This technology is improving access to screening, especially in areas where retina specialists are not readily available.
Treatment Options
Many retinal diseases involve overproduction of a protein called vascular endothelial growth factor (VEGF). This protein drives the growth of abnormal blood vessels and causes fluid leakage. Anti-VEGF medications block this process and are the standard treatment for wet AMD, diabetic macular edema (DME), and retinal vein occlusion.
These medications are delivered as intravitreal injections (injections directly into the eye). Commonly used agents include Eylea (aflibercept), Eylea HD (high-dose aflibercept), Lucentis (ranibizumab), and Vabysmo (faricimab), a bispecific antibody targeting both VEGF-A and angiopoietin-2. Avastin (bevacizumab) is FDA-approved for cancer treatment and is used off-label for eye conditions. Anti-VEGF agents do not treat dry AMD. It is important to note that anti-VEGF injections are used specifically for wet AMD and are not a treatment for dry AMD.
Geographic atrophy is an advanced form of dry AMD. It involves a different disease process than wet AMD and requires different treatments. Two complement inhibitors are now FDA-approved specifically for geographic atrophy. Syfovre (pegcetacoplan), a C3 complement inhibitor, and Izervay (avacincaptad pegol), a C5 complement inhibitor, work by slowing the immune system activity that contributes to retinal cell loss. These treatments do not restore lost vision but may help slow further progression.
Laser photocoagulation (thermal laser applied to the retina) remains important for managing proliferative diabetic retinopathy. It seals off leaking blood vessels and reduces abnormal new vessel growth. Photodynamic therapy (PDT), which uses a light-activated drug, may be used in certain cases of wet AMD.
Vitrectomy (surgery to remove the gel inside the eye) is used to treat retinal detachment, vitreous hemorrhage (bleeding inside the eye), and epiretinal membranes (scar tissue on the retinal surface). Scleral buckle surgery and pneumatic retinopexy (injecting a gas bubble into the eye) are additional surgical options for retinal detachment.
Luxturna (voretigene neparvovec) is the first FDA-approved gene therapy for an inherited retinal disease. It treats vision loss caused by mutations in the RPE65 gene. Research into gene therapy is expanding, with clinical trials underway for additional inherited retinal diseases.
Other areas of active research include continuous delivery implants that release medication over months, biosimilar versions of existing anti-VEGF agents, and combination treatments targeting multiple disease pathways.
What to Expect During Treatment
Intravitreal injections are the most common treatment for many retinal conditions. The eye is numbed with anesthetic drops or a small injection of numbing medicine. The skin around the eye is cleaned with an antiseptic solution. A very fine needle is used to inject the medication into the vitreous cavity. The procedure takes only a few minutes.
Most patients feel pressure or mild discomfort during the injection. Some soreness, redness, or a gritty feeling may last for a day or two afterward. Your retina specialist will discuss the expected treatment schedule.
Retinal diseases typically require ongoing monitoring, even after treatment begins. Regular visits may include OCT imaging, visual acuity testing, and a dilated exam. The frequency of visits depends on the condition and treatment response. Many patients find that visits become less frequent as their condition stabilizes.
Treatment goals vary by condition. For wet AMD and DME, anti-VEGF therapy often stabilizes vision and may improve it in some cases. Results depend on how early treatment begins and how much damage has occurred. For geographic atrophy, current treatments aim to slow progression rather than restore lost vision. Your retina specialist can help you understand what outcomes are realistic for your situation.
Living With a Retinal Condition
If you have been diagnosed with a retinal condition, there are steps you can take to protect your vision. Attend all scheduled appointments and follow your treatment plan. Monitor your vision at home using an Amsler grid, a simple tool that helps detect changes in central vision. Report any new symptoms to your retina specialist promptly.
Lifestyle choices can make a meaningful difference. If you smoke, quitting is one of the most important steps you can take. A diet rich in leafy green vegetables, fish, and fruits provides nutrients that support retinal health.
- Do not smoke or seek help to quit
- Eat a balanced diet with leafy greens and omega-3 fatty acids
- Exercise regularly as recommended by your doctor
- Manage diabetes, blood pressure, and cholesterol
- Wear sunglasses with UV protection outdoors
If retinal disease has caused significant vision loss, low vision rehabilitation can help you make the most of your remaining sight. Low vision specialists provide magnifying devices, adaptive technology, and training for daily tasks. Ask your retina specialist about referrals to low vision services.
When to See a Retina Specialist
People over 60 should have regular dilated eye exams to check for retinal conditions like AMD. People with diabetes should have a dilated retinal exam at least once a year. Those with a family history of retinal disease should discuss screening schedules with their eye care provider.
Certain symptoms require immediate attention. See a retina specialist or go to the emergency room right away if you notice a sudden shower of floaters, new flashes of light, a curtain or shadow in your vision, or sudden vision loss in one eye. These symptoms may signal a retinal tear or detachment. Do not wait to see if symptoms improve on their own.
Questions and Answers
Not all retinal diseases can be prevented, especially those caused by genetics or aging. However, you can lower your risk for many conditions by managing diabetes and blood pressure, not smoking, maintaining a healthy weight, and getting regular eye exams. Early detection through routine screening gives a retina specialist the best chance to treat a condition before significant vision loss occurs.
Intravitreal injections have a strong safety record and have been used for millions of patients worldwide. As with any medical procedure, there are risks, including a small chance of infection, bleeding, or increased eye pressure. Serious complications are rare. Your retina specialist takes precautions such as sterilizing the area and using proper technique to minimize risk.
Treatment duration depends on the specific condition. Many retinal diseases are chronic, meaning they require ongoing management. For wet AMD and DME, anti-VEGF injections may be needed for years, though the interval between injections often lengthens over time. Retinal detachment surgery may resolve the problem in one procedure, though follow-up monitoring remains important.
An optometrist provides comprehensive eye exams, prescribes glasses and contact lenses, and can detect signs of retinal disease during routine screenings. A retina specialist is a medical doctor who has completed additional fellowship training in diseases and surgery of the retina and vitreous. Retina specialists perform intravitreal injections, laser treatments, and vitrectomy surgery. If a retinal condition is suspected, an optometrist will typically refer you to a retina specialist.
Most floaters result from normal age-related changes in the vitreous gel inside the eye and do not threaten vision. However, a sudden increase in floaters, especially when accompanied by flashes of light or a shadow in your vision, can be a warning sign of a retinal tear or detachment. If you experience a sudden change in floaters, see a retina specialist or go to the emergency room immediately. Prompt examination can determine whether urgent treatment is needed.