Think of your cornea like a car windshield. It is a smooth, clear layer that bends light into your eye so you can see. A corneal ulcer is an open wound on that windshield. Bacteria, fungi, or other germs break through the outer layer and begin eating into the tissue beneath. Without treatment, the infection can spread deeper into the cornea within hours.
The deeper an infection reaches, the more corneal tissue it destroys. Deep ulcers can leave a scar right in your line of sight, blurring your vision long-term. In rare cases, the infection can penetrate the full thickness of the cornea and threaten the inside of the eye. Starting medicated eye drops within the first 24 hours gives your eye the best chance of healing with clear, healthy tissue.
Corneal ulcers are more common than most people realize. According to a 2014 report from the Centers for Disease Control and Prevention, keratitis, the broader category of corneal infections that includes ulcers, accounts for one million clinic and emergency room visits each year in the United States. Many of these cases start with contact lens wear, making this a concern that touches millions of people.
Contact lenses sit directly on the cornea. If a lens traps bacteria against the surface, or if you sleep in lenses that are not approved for overnight wear, the risk of infection climbs sharply. Data published by the CDC in 2016 showed that 41 million Americans wear contact lenses, and sleeping in lenses raises the risk of a corneal ulcer by 10 to 15 times compared to removing them each night.
A healthy tear film acts as a protective shield over the cornea. When your tears are thin or unstable, the cornea is more exposed. Living in the dry desert climate of the Southwest Las Vegas valley can worsen tear evaporation, leaving the surface more vulnerable. A scratch from a fingernail, a piece of debris, or even a dry, rough contact lens can create an entry point for germs.
People who take immune-suppressing medications, those with uncontrolled diabetes, or anyone recovering from a recent eye injury or eye surgery face a higher baseline risk. If you fall into any of these groups and notice sudden eye pain or redness, treat it as urgent.
The cornea has several thin layers stacked on top of each other, like sheets of clear tissue paper. The outermost layer, called the epithelium, is your first line of defense. When that layer gets scratched, dried out, or weakened by a trapped contact lens, germs can slip through the opening and settle into the tissue below.
Most corneal ulcers in contact lens wearers are caused by bacteria, especially a type called Pseudomonas. These bacteria thrive in moist environments like a contact lens case that has not been cleaned properly. Fungal and viral infections can also cause ulcers, though they are less common and sometimes harder to treat.
Once the infection takes hold, your immune system sends white blood cells to fight it. This creates the redness, swelling, and pain you feel. The white or grayish spot that may appear on your cornea is a collection of dead cells and inflammatory material at the site of the ulcer. Your eye may also produce thick discharge, and bright lights may become painful to look at.
Minor eye irritation from dust or dryness usually fades within a few hours. A corneal ulcer causes sharp, steady pain that tends to increase over time. If your eye pain has been building through the day, or it woke you up at night, that is a sign something more serious is happening.
This is one of the most distinctive signs of a corneal ulcer. If you look in a mirror and see a small white or grayish dot on the clear part of your eye, seek care the same day. Not every ulcer produces a visible spot, but when one is present, it confirms that the cornea is actively infected.
Because the ulcer sits on the surface that focuses light, even a small sore can make your vision hazy. Heavy tearing and a strong urge to close your eye in bright light are your body's attempt to protect the damaged surface. If these symptoms appear together, especially if you wear contact lenses, remove your lenses immediately and get to an eye doctor.
Your eye doctor will examine your cornea using a slit lamp, a high-powered microscope with a focused beam of light. This allows them to see the size, depth, and location of the ulcer in detail. They may apply a drop of fluorescein dye, a safe yellow-green stain that highlights damaged areas of the cornea under blue light. This step takes only a few minutes and helps guide the treatment plan.
In some cases, your doctor may gently swab the surface of the ulcer to collect a small sample. This culture test identifies which specific germ is causing the infection so the medication can be targeted precisely. For milder ulcers, your doctor may begin treatment based on the clinical appearance and adjust later if needed.
Treatment for a bacterial corneal ulcer typically involves antibiotic eye drops used frequently throughout the day, sometimes as often as every hour during the first 24 to 48 hours. Fungal or viral ulcers require different medications. Your doctor may also prescribe drops to manage pain and reduce inflammation. The goal is to stop the infection before it can dig deeper into the cornea.
The most intensive phase of treatment is the first two to three days. You will use your medicated drops on a strict schedule, often waking during the night to apply them. Most patients notice the pain beginning to ease within 48 to 72 hours as the drops start working. Your eye doctor will want to see you for a follow-up visit within one to two days to check how the ulcer is responding.
Small, superficial ulcers can heal in one to two weeks. Deeper or larger ulcers may take several weeks to months, and they carry a higher chance of leaving a scar. During healing, you will continue using eye drops on a tapering schedule, and your doctor will monitor the cornea at regular follow-up visits.
Most corneal ulcers treated early heal well, and many patients regain clear vision. If a scar forms in the center of the cornea, it may affect vision even after the infection is gone. In those cases, specialty contact lenses that vault over the scar, or in more severe situations, a referral for corneal transplant surgery, may be options to restore clarity. The earlier treatment starts, the smaller and less central the scar tends to be.
Do not sleep in contact lenses unless your eye doctor has specifically approved them for overnight wear. Replace your lens case every one to three months. Use fresh solution each time you store your lenses, and avoid topping off old solution with new. Wash and dry your hands before touching your lenses. These simple steps remove the most common triggers for contact lens-related ulcers.
The dry air and intense sun exposure in Spring Valley and the greater Southwest Las Vegas area can accelerate tear evaporation and leave your cornea more exposed. Wearing wraparound sunglasses outdoors, using preservative-free artificial tears, and staying hydrated can help keep your corneal surface healthy and resistant to infection.
A true corneal ulcer caused by infection does not reliably heal on its own. The bacteria, fungus, or virus behind the ulcer can continue to spread deeper into the cornea without medicated eye drops. Waiting even a day or two increases the risk of scarring. If you suspect a corneal ulcer, see an eye doctor the same day rather than waiting to see if it improves.
An eye doctor's office with a slit lamp and corneal expertise is the ideal setting for diagnosing and treating a corneal ulcer. Emergency rooms can evaluate your eye, but they may not have the specialized equipment to assess the depth and size of the ulcer precisely. If an eye doctor is available for a same-day appointment, that is usually the faster and more thorough option.
No. Contact lenses must stay out of the affected eye until the ulcer has fully healed and your eye doctor confirms it is safe to resume wear. Wearing a lens over an active ulcer traps medication and bacteria against the wound, which can make the infection worse. Your doctor will let you know when it is safe to return to lenses.
Pink eye, also called conjunctivitis, usually causes a gritty, itchy sensation with redness and discharge, but the pain is relatively mild. A corneal ulcer causes sharper, deeper pain that tends to worsen steadily. Light sensitivity is more pronounced with an ulcer, and you may notice a visible white spot on the cornea that is not present with simple pink eye. If the pain is intense and getting worse, treat it as a possible ulcer and seek same-day care.
It depends on the size, depth, and location of the ulcer. Small ulcers that are caught early and sit away from the center of the cornea often heal without noticeable vision changes within a few weeks. Larger or deeper ulcers, especially those near the center of vision, may leave some degree of scarring that affects clarity. Your eye doctor can discuss options like specialty contact lenses if a scar interferes with your sight.
A corneal abrasion is a scratch on the surface of the cornea. It hurts and causes tearing, but it usually heals within a day or two with proper care. A corneal ulcer involves infection beneath the surface and tends to get worse over time rather than better. The presence of a white or gray spot, increasing pain, and thick discharge suggest an ulcer rather than a simple scratch. Because an untreated abrasion can develop into an ulcer, any eye injury that does not improve within 24 hours should be evaluated by your eye doctor at Insight Vision Optometry, Las Vegas.
