Keratitis: Symptoms, Causes, and Treatment Guide

Introduction to Keratitis

Keratitis is an inflammation of the cornea, the clear, dome-shaped tissue that covers the front of the eye. The cornea is responsible for refracting light and allowing the eye to focus on objects. When the cornea becomes inflamed, it can cause pain, redness, and blurred vision. Keratitis is a serious condition that requires prompt medical attention to prevent permanent damage to the eye.

Causes of Keratitis

Keratitis can be caused by a variety of factors, including infections, injuries, and underlying health conditions. The most common causes of keratitis include:

• Bacterial infections: Bacteria such as Staphylococcus, Streptococcus, and Pseudomonas can infect the cornea and cause bacterial keratitis.
• Viral infections: Viruses such as herpes simplex virus (HSV) and varicella-zoster virus (VZV) can cause viral keratitis.
• Fungal infections: Fungi such as Candida and Aspergillus can cause fungal keratitis, which is more common in tropical and subtropical regions.
• Parasitic infections: Parasites such as Acanthamoeba can cause a rare but serious form of keratitis called Acanthamoeba keratitis.
• Injuries: Trauma to the eye, such as a scratch or chemical burn, can lead to keratitis.
• Contact lens wear: Improper contact lens hygiene or overuse of contact lenses can increase the risk of developing keratitis.

Types of Keratitis

Keratitis can be classified into several types based on the cause and severity of the inflammation:

• Infectious keratitis: This type of keratitis is caused by bacteria, viruses, fungi, or parasites.
• Non-infectious keratitis: This type of keratitis is caused by factors such as injury, autoimmune disorders, or exposure to toxic substances.
• Superficial keratitis: This type of keratitis affects only the outer layer of the cornea (epithelium).
• Stromal keratitis: This type of keratitis involves the deeper layers of the cornea (stroma) and is often more severe.

Symptoms of Keratitis

The symptoms of keratitis can vary depending on the cause and severity of the inflammation. Common symptoms of keratitis include:

• Eye pain
• Redness
• Blurred vision
• Sensitivity to light (photophobia)
• Excessive tearing
• Discharge from the eye
• Feeling of something in the eye (foreign body sensation)

Diagnosis of Keratitis

If you suspect that you have keratitis, it is important to see an eye doctor (ophthalmologist) for a proper diagnosis. The doctor will perform a thorough eye examination and may use the following tests to diagnose keratitis:

• Slit-lamp examination: This test uses a special microscope to examine the front of the eye, including the cornea, iris, and lens.
• Corneal scraping: The doctor may gently scrape the surface of the cornea to obtain a sample for laboratory testing to identify the cause of the infection.
• Imaging tests: In some cases, the doctor may use imaging tests such as optical coherence tomography (OCT) or confocal microscopy to visualize the cornea in more detail.

Treatment of Keratitis

The treatment of keratitis depends on the underlying cause of the inflammation. Treatment options may include:

• Antibiotics: If the keratitis is caused by a bacterial infection, the doctor will prescribe antibiotic eye drops or ointments to clear the infection.
• Antiviral medications: If the keratitis is caused by a viral infection such as herpes simplex virus, the doctor may prescribe antiviral medications such as acyclovir or valacyclovir.
• Antifungal medications: If the keratitis is caused by a fungal infection, the doctor may prescribe antifungal medications such as natamycin or voriconazole.
• Corticosteroids: In some cases, the doctor may prescribe corticosteroid eye drops to reduce inflammation and prevent scarring. However, corticosteroids should be used with caution as they can worsen certain types of keratitis.
• Surgery: In severe cases of keratitis, surgery may be necessary to remove damaged tissue or replace the cornea with a corneal transplant.

Complications of Keratitis

If left untreated or not properly managed, keratitis can lead to serious complications, including:

• Corneal scarring: Inflammation and ulceration of the cornea can lead to scarring, which can cause permanent vision loss.
• Corneal perforation: In severe cases of keratitis, the cornea may become so thin that it perforates, leading to a serious eye infection called endophthalmitis.
• Glaucoma: Keratitis can lead to increased eye pressure, which can damage the optic nerve and cause glaucoma.
• Cataract: Inflammation and steroid use can increase the risk of developing a cataract.

Prevention of Keratitis

There are several steps you can take to reduce your risk of developing keratitis:

• Practice good hygiene: Wash your hands frequently, especially before touching your eyes or handling contact lenses.
• Wear protective eyewear: When engaging in activities that could cause eye injury, such as sports or construction work, wear appropriate protective eyewear.
• Follow proper contact lens care: If you wear contact lenses, follow the manufacturer’s instructions for cleaning, disinfecting, and replacing them. Avoid wearing contact lenses while swimming or sleeping.
• Avoid sharing eye makeup: Do not share eye makeup or other personal items that come into contact with your eyes.
• Seek prompt medical attention: If you experience any symptoms of keratitis, such as eye pain, redness, or blurred vision, see an eye doctor promptly for evaluation and treatment.

Prognosis of Keratitis

The prognosis of keratitis depends on the underlying cause, severity, and promptness of treatment. Most cases of keratitis can be successfully treated with prompt diagnosis and appropriate therapy. However, in some cases, keratitis can lead to permanent vision loss or other complications. Early diagnosis and treatment are essential for the best possible outcome.