Understanding Corneal Ulcers
A corneal ulcer is an open sore on the cornea, the clear dome-shaped tissue that covers the front of the eye. The cornea plays an essential role in focusing light onto the retina, and any disruption to its surface can affect both comfort and vision. When the cornea develops an ulcer, the condition is also referred to as infectious keratitis, because in most cases the sore is caused by an active infection that has penetrated the outer layers of the cornea.
The cornea is made up of several distinct layers. The outermost layer, known as the epithelium, acts as a barrier against bacteria, fungi, viruses, and other organisms. When this protective layer is compromised through injury, disease, or prolonged contact lens wear, infectious organisms can invade the deeper layers of corneal tissue. Once the infection takes hold, it can cause the tissue to break down and form an ulcer. Without prompt treatment, the infection may spread deeper into the cornea, potentially threatening vision.
Corneal ulcers are considered an urgent ophthalmic condition. They can progress rapidly, and early diagnosis and aggressive treatment are critical to preserving the health and clarity of the cornea. At Washington Eye Institute, our fellowship-trained cornea specialists provide urgent evaluation and advanced care for patients with corneal ulcers and other serious corneal infections.
Because the cornea is responsible for focusing most of the light that enters the eye, any damage to its structure can have a meaningful impact on vision. If a corneal ulcer is left untreated, the infection can erode through the full thickness of the cornea, leading to complications such as deep scarring, corneal thinning, or perforation. A perforated cornea is a sight-threatening emergency that may require surgical intervention.
The inflammatory response triggered by a corneal infection can also cause swelling and the formation of scar tissue. Even after the infection has been successfully treated, residual scarring in the central cornea can interfere with vision. The sooner treatment begins, the better the chances of controlling the infection and minimizing lasting damage.
Who Should Seek Evaluation for a Corneal Ulcer
Certain individuals are at a higher risk of developing a corneal ulcer. Contact lens wear is one of the most well-known risk factors. Sleeping in contact lenses, wearing lenses for extended periods, or using lenses that have not been properly cleaned and disinfected all increase the likelihood of developing an infection. Lenses can trap bacteria and other organisms against the corneal surface, creating an environment that favors infection.
Other risk factors include:
- A recent injury or scratch to the surface of the eye, which can break through the protective epithelium and allow organisms to enter the cornea
- Chronic dry eye, which reduces the natural protective tear film that normally helps wash away debris and microorganisms
- A weakened immune system due to medical conditions or medications that suppress immune function
- Previous eye surgery, which may temporarily compromise the corneal surface
- Use of topical steroid eye drops without close medical supervision, which can reduce the eye's local immune defenses
- Conditions that prevent the eyelids from closing fully, leaving the cornea exposed and vulnerable
A corneal ulcer can develop quickly, and the symptoms often worsen over the course of hours to days. Patients should seek urgent evaluation if they experience any combination of the following symptoms:
- Significant eye pain that may feel sharp, aching, or throbbing
- A noticeable red or bloodshot appearance to the affected eye
- Sensitivity to light, also called photophobia, which may make it uncomfortable to be in bright environments
- A feeling that something is stuck in the eye, even when no foreign body is present
- Blurred or decreased vision in the affected eye
- Excessive tearing or discharge from the eye, which may appear white, yellow, or green
- A visible white or grayish spot on the cornea, which may be the ulcer itself
If you are a contact lens wearer and experience any of these symptoms, remove your lenses immediately and seek care as soon as possible. Do not attempt to treat a suspected corneal ulcer at home with over-the-counter drops, as this can delay appropriate treatment and allow the infection to worsen.
Washington Eye Institute provides urgent corneal evaluations for patients presenting with signs and symptoms consistent with corneal ulcers. Our cornea specialists understand that time is a critical factor in managing these infections and work to see patients as quickly as possible. If you are experiencing eye pain, redness, discharge, or vision changes, particularly if you wear contact lenses or have had a recent eye injury, contact our office without delay.
How Corneal Ulcer Diagnosis and Treatment Works
Diagnosing a corneal ulcer begins with a thorough examination using a slit lamp, a specialized microscope that allows the cornea specialist to view the cornea at high magnification. The doctor will assess the size, depth, and location of the ulcer, as well as look for signs of inflammation within the eye. A fluorescein dye may be applied to the eye's surface, highlighting areas where the corneal epithelium has broken down.
The appearance of the ulcer can provide important clues about the type of organism causing the infection. Based on the clinical findings, the specialist may perform a corneal culture or scraping. A small sample of tissue from the ulcer is collected using a sterile instrument and sent to a laboratory for analysis. The culture results help identify the specific organism responsible, which guides the selection of the most effective treatment.
Treatment for a corneal ulcer typically begins immediately, often before the culture results are available. In most cases, the initial treatment involves frequent application of concentrated antibiotic eye drops. These drops are used around the clock in the first several days, sometimes as often as every thirty minutes to one hour, to deliver a high concentration of medication directly to the site of infection.
This aggressive initial approach is designed to halt the progression of the infection as quickly as possible. Depending on the severity and clinical appearance of the ulcer, the specialist may also prescribe additional medications to manage pain and reduce inflammation. Patients are typically seen for follow-up within the first one to two days so the specialist can assess the response to treatment and adjust the medication regimen if needed.
Once the culture results are available, usually within a few days, the treatment plan may be refined to target the specific organism that has been identified. If the initial antibiotic drops are effective against the identified organism, treatment continues with adjustments to the dosing schedule as the ulcer begins to heal. If the cultures reveal a different type of organism, such as a fungus or virus, the medication will be changed accordingly.
Healing from a corneal ulcer can take weeks to months, depending on the severity and depth of the infection. Throughout this period, regular follow-up visits are essential to monitor progress, adjust medications, and watch for complications.
Types of Corneal Infections
Bacterial infections are the most common cause of corneal ulcers. Several types of bacteria can cause keratitis, with some organisms being more aggressive than others. Contact lens-related bacterial keratitis is frequently associated with specific types of bacteria that thrive in the moist environment between the lens and the cornea. Bacterial ulcers can progress rapidly, sometimes within hours, making early treatment essential.
Treatment for bacterial keratitis involves intensive use of antibiotic eye drops. In many cases, fortified antibiotic drops are used. Fortified drops are prepared at a higher concentration than commercially available products, allowing for more potent delivery of the medication directly to the infected tissue. The choice of antibiotic may be adjusted once culture results confirm the specific bacteria involved.
Fungal corneal ulcers are less common than bacterial ulcers but tend to be more challenging to treat. Fungal keratitis is more frequently seen in agricultural settings or tropical climates and often develops after the eye has been injured by organic material such as a tree branch, plant matter, or soil. Certain species of fungi can also cause infection in contact lens wearers.
Fungal ulcers often have a different appearance than bacterial ulcers when viewed under the slit lamp. They may have feathery or irregular borders and may develop satellite lesions, which are smaller spots of infection surrounding the main ulcer. Treatment involves antifungal eye drops, which are typically required for a longer duration than antibiotics used for bacterial infections. Fungal ulcers may take several weeks or longer to resolve, and close monitoring is essential throughout the treatment course.
Viral infections of the cornea are most commonly caused by the herpes simplex virus, the same virus responsible for cold sores. Herpes simplex keratitis can present as a characteristic branching pattern on the corneal surface known as a dendrite. The herpes zoster virus, which causes shingles, can also affect the cornea when the virus reactivates along the nerve that supplies sensation to the eye and forehead.
Treatment for viral keratitis involves antiviral medications, which may be administered as eye drops, oral tablets, or both. Unlike bacterial keratitis, viral keratitis can recur, and some patients may need long-term low-dose antiviral therapy to reduce the frequency of recurrences. Managing viral keratitis requires careful attention, as inappropriate use of certain medications, particularly steroid drops, can worsen a herpes-related infection.
Acanthamoeba keratitis is caused by a microscopic single-celled organism found in water sources such as tap water, swimming pools, hot tubs, and lakes. This type of infection is most commonly associated with contact lens wear, particularly when lenses are rinsed or stored in tap water instead of sterile contact lens solution. Swimming or showering while wearing contact lenses also increases the risk.
Acanthamoeba keratitis is often difficult to diagnose in its early stages because it can mimic other types of corneal infections. It is known for causing severe pain that may seem out of proportion to the clinical findings on examination. Treatment involves specialized antiseptic eye drops that are used frequently and for an extended period, often months. Because this infection can be resistant to treatment and is prone to recurrence, it requires careful and sustained management by a cornea specialist experienced in treating this condition.
In some cases, a corneal ulcer may involve more than one type of organism. A bacterial infection may be complicated by a secondary fungal infection, or an existing viral condition may become superinfected with bacteria. These mixed infections can be more complex to manage and may require a combination of different antimicrobial medications. Accurate identification of all organisms involved through cultures and other diagnostic tests is critical to developing an effective treatment plan.
Diagnostic Technology and Tools
The slit lamp is the primary tool used to evaluate corneal ulcers. This instrument provides high-magnification, illuminated views of the cornea and anterior segment of the eye. The cornea specialist can use different types of illumination and magnification settings to assess the depth, size, shape, and characteristics of the ulcer. The slit lamp examination also allows the doctor to evaluate the surrounding corneal tissue, the anterior chamber of the eye for signs of inflammation, and the overall health of the eye's surface structures.
Obtaining a culture from the ulcer is an important step in guiding treatment. The specialist uses a fine sterile instrument to gently collect a sample of cells and material from the base and edges of the ulcer. This sample is placed on specialized growth media designed to support the growth of bacteria, fungi, and Acanthamoeba.
Additional testing such as staining techniques may be used to provide preliminary information about the type of organism while the cultures are incubating. These early results help the specialist make informed treatment decisions before the full culture results are available.
Advanced imaging of the anterior segment of the eye can provide additional information about a corneal ulcer. High-resolution imaging allows the specialist to document the size and depth of the ulcer, monitor changes over time, and detect subtle features that may not be readily visible during a standard slit lamp examination. This imaging can be particularly valuable for tracking the healing process and identifying early signs of complications such as thinning or perforation.
Confocal microscopy is a specialized imaging technique that provides extremely detailed, layer-by-layer views of the cornea at the cellular level. This tool can be especially useful in cases where the diagnosis is uncertain or when Acanthamoeba or fungal infection is suspected. Confocal microscopy can sometimes identify the characteristic appearance of certain organisms directly within the corneal tissue, aiding in diagnosis and treatment planning without the need to wait for culture results.
What to Expect During Treatment
The initial days of corneal ulcer treatment are the most intensive. Patients should expect to use medicated eye drops very frequently, in some cases as often as every thirty minutes to one hour during waking hours. This demanding schedule is necessary to deliver a sufficient concentration of medication to the infected tissue. Patients may be asked to set alarms to ensure consistent dosing.
During this period, it is normal to experience significant discomfort. The eye may remain red, painful, and sensitive to light. Vision in the affected eye may be blurred. The specialist may prescribe additional drops to help manage pain and reduce inflammation. Oral pain medication may also be recommended. It is important to avoid rubbing the eye and to follow all instructions regarding drop administration carefully.
Close follow-up is a central part of corneal ulcer management. Patients should expect frequent visits to the office, particularly in the first week or two of treatment. During these visits, the specialist will use the slit lamp to examine the ulcer and assess whether it is responding to treatment. Signs of improvement include a decrease in the size of the ulcer, reduced surrounding inflammation, and a lessening of symptoms such as pain and discharge.
If the ulcer is not improving as expected, the specialist may modify the treatment plan. This could involve changing or adding medications, repeating cultures, or intensifying the dosing schedule. The decision to adjust treatment is based on a combination of clinical findings and laboratory results.
As the infection comes under control, the dosing frequency of the eye drops will gradually be reduced. The healing timeline varies significantly depending on the type and severity of the infection. Smaller, superficial bacterial ulcers may show substantial improvement within a week, while larger or deeper infections, particularly those caused by fungi or Acanthamoeba, may take several weeks to months to resolve fully.
As the ulcer heals, the body lays down scar tissue to repair the damaged area. If the scarring is located in the center of the cornea, it may affect vision even after the infection has been eliminated. The extent of scarring depends on how deep the infection penetrated and how quickly treatment was initiated. Some patients may eventually require additional procedures, such as corneal transplantation, to restore vision if significant central scarring develops.
While most corneal ulcers respond well to treatment, some complications can occur. These include:
- Corneal scarring that affects clarity and vision
- Corneal thinning or melting, where the infection or inflammation causes the corneal tissue to become dangerously thin
- Corneal perforation, a rare but serious complication in which the ulcer erodes through the full thickness of the cornea
- Secondary glaucoma, which can result from severe intraocular inflammation
- Spread of infection to deeper structures within the eye, a condition known as endophthalmitis
The risk of complications is reduced with early diagnosis and aggressive, appropriate treatment. This is one of the most important reasons to seek care promptly when symptoms develop.
Your Journey Through Corneal Ulcer Care
Your care begins with an urgent evaluation at Washington Eye Institute. When you call to report symptoms consistent with a possible corneal ulcer, our team will work to schedule you for a same-day or next-day appointment with a fellowship-trained cornea specialist. During your first visit, the specialist will perform a comprehensive examination of your eye, including a detailed slit lamp evaluation. If an ulcer is identified, cultures may be obtained, and treatment will typically begin the same day.
During the active treatment phase, your primary responsibility will be following the prescribed drop schedule as closely as possible. Your specialist will provide clear instructions on how to administer the drops, how often to use them, and what to watch for between appointments. Frequent office visits will be scheduled so the specialist can monitor the ulcer's response to treatment and make timely adjustments if necessary.
This phase requires patience and commitment. The intensive drop schedule can be demanding, and healing does not happen overnight. Each follow-up visit provides an opportunity to assess progress and make informed decisions about the next steps in your care.
Once the infection has been fully resolved, the focus shifts to rehabilitation. The specialist will assess the condition of the cornea and evaluate whether any scarring has developed. If your vision has been affected by scarring, the doctor will discuss options for visual rehabilitation. In some cases, a rigid contact lens such as a scleral lens can help improve vision by providing a smooth optical surface over the irregular cornea. For patients with significant scarring in the visual axis, corneal transplant surgery may be considered.
Even after the ulcer has healed, ongoing follow-up is important. Some types of corneal infections, particularly those caused by herpes simplex virus, can recur. Your specialist will advise you on preventive measures and may recommend long-term medication to reduce the risk of recurrence. Regular eye examinations allow for early detection of any new problems and help ensure the long-term health of your cornea.
Preparing for Your Appointment
Being prepared for your appointment helps your specialist make the most of the evaluation. When you come in for your visit, please bring the following:
- A list of all current medications, including any eye drops you are using
- Your contact lenses and contact lens case, if applicable, as the specialist may wish to culture these items as well
- Information about your contact lens brand, wearing schedule, and cleaning regimen
- Details about when your symptoms began and how they have changed over time
- Any recent history of eye injury, exposure to contaminated water, or changes to your contact lens routine
If you suspect you have a corneal ulcer and are waiting for your appointment, there are several steps you should take in the meantime:
- Remove your contact lenses immediately and do not reinsert them
- Do not use any over-the-counter eye drops, particularly redness-reducing drops, unless specifically instructed by a medical professional
- Avoid rubbing or touching your eye
- Wear sunglasses if you are sensitive to light
- Arrange for someone to drive you to your appointment, as your vision may be impaired and your eyes may be dilated during the examination
Coming to your appointment with questions can help you better understand your condition and treatment plan. Consider asking your specialist the following:
- What type of infection do you think is causing the ulcer
- How deep is the ulcer, and what are the risks to my vision
- What medications will I need to use, and how frequently
- How soon should I expect to see improvement
- What signs should prompt me to call the office between scheduled visits
- When will it be safe to resume wearing contact lenses
Treating a corneal ulcer requires a significant time commitment. The intensive drop schedule in the early days of treatment may require you to take time away from work or other responsibilities. Frequent follow-up appointments are necessary, particularly in the first few weeks. Planning ahead can help reduce stress and allow you to focus on your recovery.
Frequently Asked Questions
No. Contact lenses must be removed immediately when a corneal ulcer is suspected and should not be worn during the entire course of treatment. Wearing lenses over an infected cornea can trap organisms against the eye, prevent medication from reaching the ulcer, and worsen the infection. Your specialist will advise you when it may be safe to consider resuming contact lens wear after the ulcer has fully healed. In some cases, changes to your contact lens type, wearing schedule, or hygiene practices will be recommended to reduce the risk of future infections.
The healing time for a corneal ulcer depends on several factors, including the type of organism causing the infection, the size and depth of the ulcer, and how quickly treatment was started. Small bacterial ulcers that are caught early may begin to improve within several days and may heal within one to two weeks with appropriate treatment. Larger or deeper infections, and those caused by fungi or Acanthamoeba, may require weeks to months of treatment before the infection is fully controlled and healing is complete. Your specialist will provide a more specific timeline based on the characteristics of your individual case.
The impact on long-term vision depends on the location and severity of the ulcer. Ulcers that occur on the peripheral cornea, away from the central visual axis, are less likely to affect vision significantly. However, ulcers that develop in or near the center of the cornea can leave scar tissue that interferes with the passage of light, leading to blurred or reduced vision. In cases where central scarring is visually significant, options such as specialty contact lenses or corneal transplant surgery may be discussed to help restore functional vision.
Prevention is especially important for contact lens wearers, who represent a large proportion of patients with corneal ulcers. Key preventive measures include:
- Following your eye care provider's instructions for contact lens cleaning, disinfection, and replacement
- Removing contact lenses before sleeping unless your specialist has specifically approved extended wear
- Replacing your contact lens case regularly and allowing it to air dry between uses
- Avoiding exposure to water while wearing contact lenses, including swimming, showering, and using hot tubs
- Washing your hands thoroughly before handling contact lenses
- Seeking prompt evaluation for any eye injury, no matter how minor it may seem
A corneal ulcer requires specialized ophthalmic care that is best provided by a fellowship-trained cornea specialist. While an emergency room can provide initial evaluation and basic treatment, the specialized equipment, expertise, and access to fortified medications needed to optimally manage a corneal ulcer are typically found in an ophthalmology practice. If you are experiencing symptoms suggestive of a corneal ulcer, contacting an eye specialist such as those at Washington Eye Institute is the most direct path to receiving the focused, expert care your condition requires.
A corneal abrasion and a corneal ulcer are related but distinct conditions. A corneal abrasion is a superficial scratch on the cornea's outermost layer. While painful, abrasions typically heal on their own within a few days with supportive care. A corneal ulcer, on the other hand, involves a deeper disruption of the corneal tissue and is usually caused by an active infection. An untreated corneal abrasion can potentially develop into a corneal ulcer if bacteria or other organisms enter through the damaged surface. This is why even minor corneal injuries should be evaluated and monitored by an eye care professional.