Contact lenses sit directly on the cornea. Wearing them too long, sleeping in them, or not cleaning them properly can trap bacteria against the eye. In dry desert environments like Las Vegas and Henderson, lenses can lose moisture faster, making the corneal surface more vulnerable to tiny scratches where germs can enter.
Any trauma to the front of the eye creates an opening for infection. Dust, sand, or debris blown by desert winds in the Spring Valley and Enterprise areas can scratch the cornea. Even a small abrasion from a fingernail, a tree branch, or rubbing your eyes too hard can set the stage for a corneal ulcer.
Dry eye reduces the tear film that protects the corneal surface. Without enough moisture, the cornea is more exposed to damage and infection. Patients with conditions like keratoconus, previous corneal surgery, or eyelid problems that prevent the eye from closing fully are also at higher risk.
Conditions like diabetes or autoimmune diseases, and medications that suppress the immune system, make it harder for your body to fight off infections. A minor irritation that a healthy immune system might handle on its own can develop into a full corneal ulcer in someone whose defenses are compromised.
Think of the cornea as a perfectly smooth, clear windshield. When a scratch, a dry spot, or a worn contact lens creates a tiny crack in that windshield, bacteria or other organisms can slip through. Once inside, they begin to multiply in the corneal tissue.
As germs multiply, your immune system sends white blood cells to fight them. This creates inflammation, swelling, and a visible white or grayish spot on the cornea. That spot is the ulcer itself. The deeper the infection reaches, the more damage it can cause to the layers of the cornea.
Because the cornea is responsible for focusing light into your eye, any clouding or scarring from the ulcer disrupts your vision. Patients often notice blurry vision, sensitivity to light, and a feeling like something is stuck in the eye. The sooner treatment starts, the less scarring develops.
A corneal ulcer usually causes significant eye pain, not just mild irritation. The pain tends to get worse over hours rather than better. The eye becomes very red, and the redness may be concentrated around the cornea. If you notice pain that worsens when you blink or look at light, that is a signal to seek care right away.
In some cases, you or someone close to you can actually see the ulcer. It appears as a white or grayish patch on the clear part of the eye. Not every corneal ulcer is visible to the naked eye, but when you can see it, the infection is significant.
Excessive tearing and discharge, especially if the discharge is thick or yellowish, are signs of infection. Blurry vision or a foggy quality to your sight in the affected eye means the infection is interfering with corneal clarity. Sudden sensitivity to light, called photophobia, is another common warning sign.
The eyelid on the affected side may become puffy and swollen. This happens because the inflammation from the infection spreads to the surrounding tissue. A swollen lid combined with pain and redness should prompt an urgent visit to your eye doctor.
Bacterial infections are the most common cause of corneal ulcers, especially in contact lens wearers. Common bacteria like Pseudomonas and Staphylococcus can cause rapid, aggressive damage to the cornea. These ulcers tend to progress quickly, which is why early treatment is so important.
Fungal ulcers are less common but can develop after an eye injury involving plant material, soil, or organic matter. They tend to progress more slowly than bacterial ulcers and can be harder to diagnose because the symptoms may start mild. Fungal ulcers often require longer treatment with specialized antifungal drops.
The herpes simplex virus, the same virus that causes cold sores, can infect the cornea and create ulcers. These tend to recur and require antiviral medication. If you have a history of cold sores and develop eye pain or redness, let your eye doctor know.
This rare but serious type of corneal infection is caused by a microscopic organism found in water, including tap water, pools, and hot tubs. It is most common in contact lens wearers who rinse their lenses or cases with tap water. Acanthamoeba keratitis, a parasitic infection of the cornea, can be very painful and difficult to treat.
Corneal ulcers are not rare. According to data published by the National Library of Medicine, there are an estimated 930,000 doctor office and emergency department visits each year in the United States related to keratitis and corneal ulcers. Data from the same source shows that 58,000 of those visits happen in emergency departments. These numbers show why early recognition matters.
A 2024 review published in the journal BMC Ophthalmology found that 70 percent of patients with corneal ulcers healed with medical management alone. According to the same BMC Ophthalmology review, 14 percent of patients needed a therapeutic bandage contact lens, and another 14 percent required a corneal transplant procedure. Early treatment with the right medication gives the cornea the best chance of healing without surgery.
Your eye doctor will use a slit lamp, a specialized microscope with a bright light, to get a magnified view of the cornea. A drop of fluorescein dye, a harmless orange dye, may be placed on the eye. The dye highlights damaged areas of the cornea so the ulcer's size and depth become visible under the light.
In some cases, your doctor may take a small sample, called a culture, from the surface of the ulcer. This helps identify whether bacteria, fungi, or another organism is causing the infection. Knowing the exact cause helps your doctor choose the most effective medication.
Most corneal ulcers are treated with antibiotic, antifungal, or antiviral eye drops depending on the cause. For serious infections, the drops may need to be applied every hour, even through the night, during the first few days. Your eye doctor will adjust the schedule as the ulcer begins to heal. Patients in the Paradise and Southwest Las Vegas areas can reach our office for close follow-up visits during the treatment period.
Corneal ulcers need frequent follow-up visits so your doctor can track healing and adjust medication. In the first week, you may be seen every one to two days. As the ulcer responds to treatment, visits become less frequent. If the ulcer is not responding, your doctor may change your medication or refer you for additional care.
When you notice symptoms like severe eye pain, redness, light sensitivity, or a white spot on the eye, the first step is an urgent eye exam. At Insight Vision Optometry, Las Vegas, our team offers same-day appointments for eye emergencies. The faster you are seen, the better the outcome for your cornea.
Once your eye doctor identifies the ulcer and its likely cause, treatment begins right away. You will receive detailed instructions on how often to use your eye drops and what activities to avoid. If you wear contact lenses, you will need to stop wearing them until the ulcer is fully healed and your doctor clears you.
Most corneal ulcers take one to several weeks to heal, depending on the size, depth, and cause of the infection. During recovery, it is normal to have some blurry vision and light sensitivity. As the cornea heals, these symptoms improve. Your doctor will let you know when it is safe to resume contact lens wear.
After a corneal ulcer heals, some patients are left with a small scar on the cornea. If the scar is in the center of the cornea, it may affect vision. In those cases, specialty contact lenses can sometimes improve clarity by creating a smooth optical surface over the scar. Your eye doctor will discuss options based on your individual healing.
