Corneal Ulcer: Symptoms, Causes, and Treatment
What Is a Corneal Ulcer and Why Is It Urgent?
Understanding what a corneal ulcer is and how quickly it can progress helps explain why we take it so seriously. The cornea is the clear dome at the front of your eye, and when it becomes infected or damaged, even a small ulcer can threaten your sight within hours or days.
Your cornea acts as a protective window over the colored part of your eye. When something breaks through its outer layer, such as a scratch, contact lens irritation, or a foreign object, germs including bacteria, fungi, viruses, or parasites can enter and multiply quickly. The result is an infection that eats away at corneal tissue and forms an open sore.
Not all corneal ulcers are caused by infection. Some develop from noninfectious conditions such as severe dry eye, poor eyelid closure, loss of corneal sensation, or autoimmune disease. Regardless of the cause, every corneal ulcer requires urgent evaluation by an eye doctor.
The cornea plays a central role in your ability to see clearly. An ulcer can rapidly damage this delicate tissue and cause blurred or lost vision. Some infections progress in just hours, making same-day evaluation essential.
Delaying treatment increases the risk of permanent damage. The sooner we identify the cause and begin appropriate therapy, the better your chances of a full recovery.
When a corneal ulcer goes untreated, the consequences can be severe and irreversible. The infection may spread deeper into the eye or cause the cornea to perforate completely.
- Permanent corneal scarring that distorts or blocks vision
- Need for a corneal transplant to restore usable sight
- Spread of infection to deeper structures of the eye
- Permanent vision loss or, in extreme cases, loss of the eye
Warning Signs and Symptoms of a Corneal Ulcer
Recognizing the symptoms of a corneal ulcer early is critical. Some symptoms overlap with other eye conditions, but certain combinations should always be treated as an emergency until a specialist can evaluate you.
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. It often worsens when you blink or when light hits the eye, and it does not go away on its own.
Some patients describe the sensation as sandpaper rubbing against their eye. The discomfort typically intensifies over time rather than improving without treatment.
A corneal ulcer often causes vision to become blurry or hazy because infection and inflammation cloud the normally clear cornea. You may struggle with reading, driving, or seeing fine details.
How much your vision is affected depends on where the ulcer is located and how large it has become. Ulcers in the center of the cornea tend to cause more noticeable vision problems than those near the outer edge.
Your eye will likely appear red or bloodshot because blood vessels in the white part of the eye become swollen and inflamed. Excess tearing and strong sensitivity to light are also very common with corneal ulcers.
- Bright redness around the cornea or across the entire eye
- Watery eyes or constant tearing
- Strong discomfort in normal indoor or outdoor light
- Squinting or an inability to keep the eye open in lit rooms
Many corneal ulcers appear as a white, gray, or cloudy spot on the surface of the eye that you may be able to see in a mirror. Sometimes the spot is very small, but it can also be large enough to see easily. This mark represents the area where the cornea is damaged and infected, and it is one of the key findings we look for during your exam.
Infected eyes often produce discharge or pus. You may wake up with eyelids stuck together from dried material, and the drainage may be yellow, green, white, or clear depending on the type of infection.
Thick or colored discharge usually points to a bacterial cause. Even clear discharge combined with other symptoms deserves immediate attention from an eye doctor.
Some symptoms signal that you need emergency eye care without waiting. Do not attempt to manage these at home or delay until the next available appointment.
- Sudden or rapidly worsening vision loss
- Severe eye pain not relieved by over-the-counter pain medicine
- A visible white or cloudy spot on your cornea
- Any eye symptoms that follow an injury or contact lens wear
- Worsening light sensitivity or an inability to keep your eye open
- Eye pain combined with fever or feeling generally unwell
While seeking care, take these important safety steps to avoid making things worse.
- 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 specifically instructs you
- Do not drive if your vision is significantly reduced
- Seek emergency care if you cannot reach an eye doctor the same day
Who Is at Higher Risk for Corneal Ulcers?
Certain habits, health conditions, and eye problems make corneal ulcers more likely. Knowing your risk factors helps you take steps to protect your corneas and recognize problems early.
Contact lens users face a significantly higher risk of corneal ulcers than people who wear glasses. Sleeping in lenses not approved for overnight wear, wearing them longer than recommended, or using dirty cases can trap bacteria directly against your cornea. Even a single night of sleeping in the wrong type of lens can raise your risk.
Swimming or showering while wearing contacts is also dangerous. Water from pools, hot tubs, lakes, and even tap water can carry harmful parasites and bacteria. Always remove your lenses before any water exposure and follow proper cleaning routines carefully.
Any scratch or wound on the cornea creates an entry point for infection. Common causes include being poked by a fingernail, tree branch, or makeup brush, as well as foreign material lodged under the eyelid.
- Metal shavings or wood splinters that scratch the cornea
- Scratches from plants, pets, or children
- Chemical splashes that damage the corneal surface
- Corneal abrasions from trauma or debris under the eyelid
Chronic dry eye reduces your natural defense against infection. Your tears normally wash away germs and keep the cornea healthy and moist. When tear production is inadequate or tears evaporate too quickly, the corneal surface becomes vulnerable to damage and infection.
Other problems such as eyelid inflammation, eyelashes that turn inward, or difficulty fully closing your eyelids can also lead to corneal damage over time. Treating these underlying conditions is an important part of preventing ulcers.
A healthy immune system normally fights off infections before they become serious. When immune defenses are reduced, even mild organisms can cause a severe corneal ulcer. People living with diabetes, HIV, or certain cancers may have a harder time fighting off corneal infections.
Medications that suppress the immune system, including steroids, chemotherapy drugs, and medicines used after organ transplants, also increase risk. Please let us know about any conditions or medications that may be affecting your immune system so we can tailor your care accordingly.
Recent eye surgery can temporarily weaken the cornea and make it more susceptible to infection. Procedures such as LASIK, cataract surgery, or corneal transplantation require careful aftercare, and we will provide specific instructions to protect your eye during the healing period.
The herpes simplex virus, the same virus responsible for cold sores on the mouth, can also infect the cornea and cause ulcers during an outbreak. This type of corneal ulcer requires antiviral treatment rather than antibiotics, which is one reason identifying the cause of your ulcer is so important.
How We Diagnose a Corneal Ulcer
Diagnosing a corneal ulcer involves more than just looking at your eye. We use a combination of your medical history, a detailed examination, and laboratory testing to determine what is causing the ulcer and guide the right treatment.
Your visit begins with a detailed conversation about your symptoms, contact lens habits, recent eye injuries, and overall health history. This background helps us understand what may have triggered the ulcer and what organisms might be involved.
We then check your vision and examine both eyes using specialized equipment. The exam is thorough but usually takes less than an hour, and we will explain each step as we go.
The slit lamp is a high-powered microscope that allows us to examine your cornea in great detail. Using a bright light and high magnification, we can see the size, depth, and exact location of the ulcer. This exam is the cornerstone of corneal ulcer diagnosis.
We often apply a safe orange dye called fluorescein stain to your eye during the exam. Under blue light, this dye glows bright green and makes damaged areas of the cornea easy to identify. It washes out naturally with your tears and does not harm your eye.
Identifying the specific organism causing your ulcer helps us choose the most effective treatment. We may gently collect a small sample from the ulcer using a sterile swab or a tiny instrument, which is then sent to a laboratory for analysis.
- Bacterial culture to identify the specific type of bacteria present
- Fungal culture when a fungal infection is suspected
- Viral testing for herpes simplex or other viruses
- Parasite testing, particularly for contact lens wearers
We are most likely to collect cultures for large or centrally located ulcers, contact lens-related infections, cases that look unusual, patients with weakened immune systems, and ulcers that are not responding to initial treatment. When possible, we obtain samples before starting antibiotic therapy to improve accuracy.
Some ulcers require more investigation beyond the standard exam. We may photograph your eye to track changes over time or use imaging to see how deeply the infection has spread.
When an ulcer appears atypical or does not respond as expected, we may explore underlying health conditions such as autoimmune disease or immunodeficiency that could be affecting your healing. We will always explain any additional tests before performing them.
Treatment Options for Corneal Ulcers
Treatment depends on what is causing the ulcer and how severe it is. Our goal is to eliminate the infection, control inflammation, manage pain, and protect as much of your natural cornea as possible.
Most corneal ulcers are treated first with prescription eye drops. We typically begin with antibiotic drops that cover common bacterial causes, and you may need to use them very frequently at first, sometimes every 30 to 60 minutes around the clock.
If testing reveals a fungal or viral infection, we will switch to antifungal or antiviral drops instead. Fungal ulcers can be harder to treat and may require medication for several weeks or months. Steroid eye drops should never be used unless specifically directed by your eye doctor, as they can worsen many infections.
Some corneal ulcers require oral medications alongside eye drops. Systemic treatment is used for specific infections such as herpes simplex, herpes zoster, gonorrhea, or chlamydia, and in carefully selected severe cases where additional support is clinically appropriate.
You will take these medications on a set schedule, often several times per day. It is important to complete the entire course even if your eye begins to feel better. Stopping early can allow the infection to return stronger than before.
Corneal ulcers can be quite painful, and keeping you comfortable during healing is part of our care plan. Over-the-counter pain relievers such as acetaminophen or ibuprofen often help, and we may prescribe stronger relief if needed.
We frequently prescribe cycloplegic eye drops to relax the muscles inside your eye, which reduces pain and light sensitivity. It is very important that you do not use topical numbing drops on your own, as repeated use can slow healing and cause serious damage to the cornea.
- Cool compresses applied gently to the closed eye for comfort
- Lubricating eye drops to ease dryness and irritation
- Dark sunglasses to reduce light sensitivity when outdoors
- Rest and avoiding activities that strain your eyes
Some ulcers do not heal with medication alone. If the infection is very severe or the cornea has perforated, surgery may become necessary. A corneal transplant replaces damaged tissue with healthy donor tissue and can restore vision when other treatments have not been sufficient.
Other procedures include amniotic membrane grafts to support healing or techniques to seal small perforations. We will discuss all available options with you thoroughly if surgery becomes necessary, and 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 recommend admission if the infection is spreading rapidly, if you are unable to administer very frequent eye drops at home, if close monitoring is needed for a vision-threatening ulcer, or if your overall health places you at high risk.
Hospital treatment typically involves around-the-clock intensive topical therapy, with intravenous medications used only in specific situations such as infections that may be spreading beyond the cornea. Most hospital stays last a few days to a week, after which treatment continues at home with regular follow-up visits.
Recovery and Protecting Your Vision After Treatment
Recovering from a corneal ulcer requires consistent follow-through with your treatment plan, careful activity restrictions, and close communication with our team. Taking the right steps during recovery significantly improves your long-term outcome.
Following your medication schedule precisely is the most critical part of recovery. Setting alarms on your phone and keeping a written log of each dose helps ensure you do not miss any treatments, especially during the initial phase when drops may be needed very frequently.
Store your medications as directed, checking whether they need refrigeration, and monitor expiration dates. If you run out of medication before your next appointment, contact us right away for a refill rather than stopping treatment.
Your eye needs time and protection to heal properly. Certain activities carry a risk of reinjury or introducing new contaminants, and we will advise you to avoid them until your cornea has recovered.
- No swimming, hot tubs, or getting water in the eye during healing
- No eye makeup until we give you specific clearance
- Avoid rubbing or touching your eye
- Skip contact sports and activities with a risk of eye injury
- Limit screen time if it causes strain or discomfort
We will schedule frequent follow-up visits to monitor your healing closely. You may come in every day or two at first, then less often as the ulcer improves. These visits allow us to confirm that treatment is working and address any concerns before they become complications.
During each visit, we examine the ulcer to assess its size and depth and check your vision for changes. Please do not skip these appointments, even if your eye feels much better. Improvement in symptoms does not always mean the infection is fully resolved.
After recovering from a corneal ulcer, prevention becomes a priority. If you wear contact lenses, we will review your hygiene practices and discuss whether daily disposable lenses or a switch to glasses would be safer for you going forward.
Addressing underlying risk factors is also important. This may mean managing dry eye more effectively, treating eyelid conditions, or using protective eyewear during work or sports. Practical prevention steps include the following.
- 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 care 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 changes in vision can signal that the infection is not responding as expected, and we may need to adjust your medications.
Do not stop your medications on your own, even if things seem worse before they improve. Some treatments take time to work. However, always call us right away so we can evaluate whether any changes to your care plan are needed.
Frequently Asked Questions
Here are answers to questions we commonly hear from patients about corneal ulcers, offering practical guidance beyond what is covered above.
It is not safe to wait and see with a suspected corneal ulcer. Infectious ulcers will not clear without appropriate prescription medication, and even a small ulcer can progress to serious scarring or perforation without treatment. If you are unsure whether what you are experiencing is truly a corneal ulcer, the right move is still to be evaluated the same day, because an eye doctor is the only one who can safely rule out a sight-threatening infection.
Healing time varies widely depending on the cause and how early treatment began. Bacterial ulcers treated promptly may show significant improvement within one to three weeks. Fungal and parasitic ulcers often take considerably longer, sometimes two to three months or more, and require strict adherence to a prolonged medication schedule. Your follow-up visits allow us to track progress and adjust treatment if healing is slower than expected.
Many corneal ulcers heal without lasting vision problems when treatment begins quickly. However, ulcers that are large, centrally located, or deeply invasive carry a higher risk of leaving scars that permanently affect your sight. This is why seeking care within the first few hours of symptoms gives you the best possible outcome. If scarring does occur, options such as corneal transplantation may be considered depending on the severity.
Returning to contact lenses after a corneal ulcer is a decision made together with your eye doctor based on how completely your eye has healed and what caused the ulcer in the first place. We generally recommend waiting until the ulcer is fully resolved and your eye has been stable for several weeks. Some patients return to lens wear successfully with stricter hygiene protocols, while others are better served by switching to daily disposable lenses or glasses full time to reduce the chance of recurrence.
The ulcer itself does not spread from person to person, but some of the organisms that cause corneal ulcers are contagious. Herpes simplex virus and adenovirus can both spread through direct contact or contaminated surfaces and could potentially affect your other eye or someone you live with. Washing your hands frequently, avoiding touching your eyes, not sharing towels or eye makeup, and following good hygiene practices are important protective steps during and after treatment.
A corneal abrasion is a surface scratch that does not involve active infection. It is painful and needs treatment, but it is generally less serious than an ulcer. A corneal ulcer develops when an infection takes hold in damaged corneal tissue, creating an open sore that can penetrate deeper layers. Abrasions that are not treated properly can become infected and progress to ulcers, which is why any significant eye injury deserves prompt evaluation rather than a wait-and-see approach at home.
Get Urgent Help for a Corneal Ulcer
At Rhode Island Eye Institute, our team of specialists is experienced in diagnosing and treating corneal ulcers with urgency and precision. We know how frightening sudden eye pain and vision changes can be, and we are committed to providing the fast, expert care you need to protect your sight. If you are experiencing symptoms of a corneal ulcer, please do not delay reaching out to our team right away.