Corneal Ulcer
What Is a Corneal Ulcer and Why Is It Urgent?
Your cornea is the clear dome that covers the colored part of your eye. When bacteria, fungi, viruses, or parasites invade the cornea, they can create an infection. The infection damages the corneal tissue and forms an open sore or ulcer.
While most corneal ulcers are caused by infection, some can result from noninfectious conditions such as severe dry eye, poor eyelid closure, loss of corneal sensation, or autoimmune disease. All corneal ulcers require urgent evaluation by an eye doctor to determine the cause and proper treatment.
Most corneal ulcers start after something breaks through the protective outer layer of the cornea. This break might come from a scratch, contact lens irritation, or foreign material in the eye. Once the barrier is broken, germs can enter and multiply quickly.
The cornea plays a vital role in helping you see clearly. An ulcer can rapidly damage this delicate tissue and blur your vision. Without fast treatment, the infection can spread deeper into the eye.
We consider corneal ulcers urgent because some infections can progress in just hours or days. The sooner we start treatment, the better your chances of full recovery. Delaying treatment can increase the risk of permanent vision damage.
Untreated corneal ulcers can lead to serious problems. The infection may create permanent scars on your cornea that block or distort your vision. In severe cases, the ulcer can perforate completely through the cornea.
- Permanent vision loss or blindness in the affected eye
- Corneal scarring that requires a transplant
- Spread of infection to other parts of the eye
- Loss of the eye in extreme cases
Warning Signs and Symptoms of a Corneal Ulcer
Most people with a corneal ulcer feel significant pain in the affected eye. The pain may be sharp, burning, or feel like something is stuck in your eye. You might notice the pain gets worse when you blink or when light hits your eye.
Some patients describe the sensation as feeling like sandpaper rubbing against the eye. The discomfort usually does not go away on its own and often becomes more intense over time.
A corneal ulcer often causes your vision to become blurry or hazy. The infection and inflammation cloud the normally clear cornea. You may have trouble reading, driving, or seeing details you could see clearly before.
The amount of vision loss depends on where the ulcer is located and how large it has grown. Ulcers in the center of the cornea usually cause more vision problems than those near the edge.
Your eye will likely look red or bloodshot when you have a corneal ulcer. The blood vessels in the white part of the eye become swollen and visible. Your eye may also produce excess tears as it tries to wash away the irritation.
- Bright redness around the cornea or across the whole eye
- Watery eyes or constant tearing
- Strong discomfort in normal light or sunlight
- Squinting or needing to close your eye in lit rooms
Many corneal ulcers appear as a white, gray, or cloudy spot on the surface of the eye. You might be able to see this spot when you look in a mirror. Sometimes the spot is very small, but other times it can be large enough to notice easily.
The spot represents the area where the cornea is damaged and infected. This visible mark is one of the key signs that help us identify a corneal ulcer during your exam.
Infected eyes often produce discharge or pus. You may wake up with your eyelids stuck together from dried discharge. The drainage can be yellow, green, white, or clear depending on what is causing the infection.
Thick or colored discharge usually means bacteria are present. Even clear discharge paired with other symptoms deserves immediate medical attention.
Certain warning signs tell you that you need emergency eye care right away. Do not wait until the next day or try to treat these symptoms at home.
- Sudden or rapid vision loss in one or both eyes
- Severe eye pain that is not relieved by over-the-counter pain medicine
- A visible white or cloudy spot on your cornea
- Any eye symptoms after an injury or contact lens wear
- Worsening photophobia or inability to keep your eye open
- Eye pain with fever or feeling sick overall, which may suggest a broader infection
While seeking care, take these safety steps:
- Stop wearing contact lenses immediately and bring your lenses and case to your appointment if asked
- Do not patch or cover the affected eye
- Do not use leftover prescription eye drops, especially steroid-containing drops, unless an eye doctor instructs you
- Do not drive if your vision is significantly reduced
- Seek emergency care now if you cannot reach an eye doctor the same day
Who Is at Higher Risk for Corneal Ulcers?
Contact lens users face a higher risk of developing corneal ulcers than people who do not wear lenses. Sleeping in your contacts, wearing them longer than recommended, or using dirty lenses can trap bacteria against your cornea. Even one night of sleeping in lenses that are not approved for overnight wear increases your risk.
We often see corneal ulcers in people who swim or shower while wearing contacts. Water from pools, hot tubs, lakes, and tap water can carry dangerous parasites and bacteria. Always remove your lenses before any water activity and follow proper cleaning routines.
Any scratch or injury to your eye creates an opening for infection. Common causes include getting poked by a fingernail, tree branch, or makeup brush. Even a tiny scratch can become a serious ulcer if bacteria enter the wound.
- Injuries from foreign objects like metal shavings or wood splinters
- Scratches from plants, pets, or children
- Chemical splashes that damage the corneal surface
- Corneal abrasions from trauma or foreign bodies under the eyelid
Chronic dry eye reduces your natural protection against infection. Your tears normally wash away germs and keep the cornea healthy. When you do not produce enough tears or they evaporate too quickly, your cornea becomes vulnerable.
Other eye problems also raise your risk. Conditions like eyelid inflammation, eyelashes that turn inward, or problems with fully closing your eyelids can all lead to corneal damage. We may recommend treating these underlying issues to prevent ulcers.
Your immune system normally fights off infections before they become serious. When your immune defenses are down, even mild germs can cause severe ulcers. People with diabetes, HIV, or cancer may have a harder time fighting corneal infections.
Medications that suppress the immune system also increase risk. This includes steroids, chemotherapy drugs, and medicines taken after organ transplants. Let us know about any conditions or medications that affect your immune system.
Recent eye surgery can temporarily weaken the cornea and make infection more likely. Procedures like LASIK, cataract surgery, or corneal transplants require careful aftercare to prevent complications. We will give you specific instructions to protect your eyes during healing.
The herpes simplex virus that causes cold sores can also infect the eye. If you have a history of cold sores on your mouth, the same virus can create corneal ulcers during outbreaks. This type of ulcer needs antiviral treatment rather than antibiotics.
How We Diagnose a Corneal Ulcer
Your visit starts with questions about your symptoms and medical history. We will ask when your symptoms started, whether you wear contact lenses, and if you recently injured your eye. This information helps us understand what might have caused the ulcer.
Next, we check your vision in each eye and look at how your eyes move and react to light. We examine both the inside and outside of your eye using specialized equipment. The exam is thorough but usually takes less than an hour.
The slit lamp is a microscope that lets us see your cornea in great detail. We use a bright light and high magnification to examine the ulcer closely. This tool helps us determine the size, depth, and location of the damage.
We often apply fluorescein stain to your eye during the exam. This safe orange dye glows bright green under blue light and makes damaged areas of the cornea easy to see. The stain washes out naturally with your tears and does not harm your eye.
Knowing what is causing your ulcer helps us choose the right treatment. We may gently collect a small sample from the ulcer using a sterile swab or tiny instrument. The sample goes to a laboratory where technicians can identify bacteria, fungi, or other organisms.
- Bacterial culture to find the specific type of bacteria
- Fungal culture if we suspect a fungal infection
- Viral testing for herpes or other viruses
- Parasite testing for contact lens wearers
We are more likely to collect cultures for large or centrally located ulcers, contact lens related infections, cases that look atypical, patients who are immunocompromised, or ulcers not responding to initial treatment. When possible, we obtain samples before starting antibiotic therapy to improve accuracy.
Some complicated cases require more testing. We might take photographs of your eye to track changes over time. In rare situations, we use imaging tests to see how deep the infection has spread.
When an ulcer appears atypical or is not responding as expected, we may consider systemic workup to check for underlying conditions such as autoimmune disease, immunodeficiency, or other health problems that might be affecting your healing. We will explain any extra tests before we perform them.
Treatment Options for Corneal Ulcers
Most corneal ulcers require prescription eye drops to kill the infection. We typically start with antibiotic drops that work against common bacteria. You may need to use the drops very frequently at first, sometimes every 30 minutes to one hour around the clock.
If tests show a fungal or viral infection, we will switch to antifungal or antiviral drops instead. Fungal ulcers are less common but can be harder to treat. Treatment may last several weeks or months depending on how the ulcer responds.
Do not use steroid eye drops unless specifically directed by your eye doctor. Steroids can worsen many types of corneal infections and are used only in carefully selected cases after the infection is controlled.
Some corneal ulcers require oral medications in addition to eye drops. Systemic therapy is used for specific infections such as herpes simplex, herpes zoster, gonorrhea, or chlamydia, and in selected severe cases where added treatment may be beneficial. We prescribe oral antibiotics, antivirals, or antifungals based on the organism causing your ulcer and other clinical factors.
You will take these medications on a set schedule, often several times per day. Finish the entire course even if your eye starts feeling better. Stopping too early can allow the infection to come back stronger.
Corneal ulcers can be very painful, so we focus on keeping you comfortable while the infection heals. Over-the-counter pain relievers like acetaminophen or ibuprofen often help. We may also prescribe stronger pain medicine if needed.
We often prescribe cycloplegic eye drops to relax the muscles inside your eye and reduce pain and light sensitivity. Do not use topical anesthetic numbing drops on your own. These drops can delay healing and cause serious damage if used repeatedly outside of supervised office visits.
- Cool compresses applied to the closed eye for comfort
- Lubricating eye drops to ease dryness and irritation
- Dark sunglasses to reduce light sensitivity
- Rest and avoiding activities that strain your eyes
Some ulcers do not heal with medication alone. If the infection is severe or the cornea has perforated, you may need surgery. A corneal transplant replaces the damaged tissue with healthy donor tissue. This procedure can save your vision when other treatments fail.
Other procedures include amniotic membrane grafts to help healing or techniques to seal small perforations. We will discuss all options with you if surgery becomes necessary. Our goal is always to preserve as much of your natural cornea as possible.
The most serious corneal ulcers may require hospital care. We may admit you if the infection is spreading rapidly, if you cannot administer frequent eye drops properly at home, if you need close monitoring for a vision-threatening ulcer, or if you are at high risk due to other health conditions. Treatment in the hospital typically involves around-the-clock intensive topical therapy. Intravenous medications are used only in specific situations such as certain severe infections or concern for spread beyond the cornea.
Most hospital stays for corneal ulcers last a few days to a week. You will receive intensive treatment during this time. Once the infection is under control, you can usually continue treatment at home with frequent office visits.
Recovery and Protecting Your Eyes After Treatment
Sticking to your medication schedule is the most important part of recovery. Set alarms on your phone to remind you when to use your eye drops. Keep a written log of each dose so you do not miss any or accidentally use too much.
Some medications need to be kept cold, while others work best at room temperature. Store your medicines properly and check the expiration dates. If you run out before your next appointment, call our office right away for a refill.
Your eye needs time to heal, so we recommend avoiding certain activities. Do not swim, use hot tubs, or get water in your eye while the ulcer is healing. Skip contact sports, heavy lifting, and anything that could injure your eye.
- No eye makeup until we give you clearance
- Avoid rubbing or touching your eye
- Stay home from work or school if needed for rest
- Limit screen time if it causes strain or discomfort
We will schedule frequent follow-up visits to check your healing. You might come back every day or two at first, then less often as the ulcer improves. These appointments let us see if the treatment is working and catch any problems early.
During follow-up visits, we examine the ulcer to measure its size and depth. We also check your vision and look for signs of complications. Never skip these appointments, even if your eye feels much better.
Once you have had a corneal ulcer, you want to prevent another one. If you wear contact lenses, we will review proper hygiene and consider whether you should switch to daily disposable lenses. Many people choose to wear glasses more often or switch to glasses full time after an ulcer.
Address any underlying eye conditions that increase your risk. This might mean treating dry eyes, managing autoimmune diseases better, or protecting your eyes during work or sports. We can recommend protective eyewear and other strategies to keep your corneas healthy.
Practical steps to reduce your risk include:
- Discard and replace your contact lenses, case, and solution after an ulcer when your doctor clears you to resume lens wear
- Never rinse contact lenses or cases with tap water
- Do not top off old contact lens solution with fresh solution
- Replace eye makeup after an eye infection and avoid sharing cosmetics
- Follow all contact lens hygiene instructions carefully if you continue wearing lenses
Contact us immediately if your symptoms come back or get worse during treatment. New pain, increased redness, more discharge, or vision changes can signal that the infection is not improving. If you have resumed contact lens wear, stop wearing your lenses right away. Sometimes we need to change medications or add new treatments.
Do not stop your medications on your own, even if things seem worse at first. Some treatments take time to work. However, do call us right away so we can evaluate whether adjustments are needed.
Frequently Asked Questions
No, any suspected corneal ulcer needs urgent professional evaluation and treatment. Infectious corneal ulcers will not heal without appropriate medication and can lead to permanent vision loss. Even small ulcers need prescription medication to clear the infection and prevent complications.
Healing time varies from one week to several months depending on the cause and severity. Bacterial ulcers often improve within one to three weeks with proper treatment. Fungal and parasitic ulcers typically take longer, sometimes two to three months or more.
Many corneal ulcers heal without lasting vision problems if treated early. However, ulcers that damage the central cornea or go deep may leave scars that affect your sight. Getting treatment within the first day or two gives you the best chance of full recovery.
We usually recommend waiting until the ulcer is completely healed and your eye has been stable for several weeks. Some people can return to contact lenses safely with stricter hygiene practices. Others may need to switch to daily disposable lenses or avoid contacts altogether to prevent recurrence.
The ulcer itself is not contagious from person to person. However, some of the viruses that can cause corneal problems are contagious. Herpes simplex virus and adenovirus can spread through direct contact or contaminated surfaces. Practice good hand hygiene, avoid touching your eyes, do not share towels or cosmetics, and wash your hands frequently to prevent spreading infection to others or your other eye.
Getting Help for Corneal Ulcer: Is It an Emergency?
Any suspected corneal ulcer needs same-day urgent evaluation by an eye doctor. If you have eye pain, redness, vision changes, or a visible spot on your cornea, seek care immediately. Early treatment can save your vision and prevent serious complications.