What is Keratitis? Causes, Symptoms and Treatment
Our eyes are regularly exposed to dust, pollution, screen strain, and long hours of daily activity, so occasional redness or irritation may not always seem concerning. In many cases, these
symptoms are temporary and improve with rest. However, when discomfort persists or is accompanied by pain, blurred vision, watering, or sensitivity to light, it may sometimes indicate an underlying eye condition such as Keratitis.
Keratitis affects the cornea, the clear front surface of the eye that helps protect the eye and maintain sharp vision. When the cornea becomes inflamed or infected, it can lead to symptoms such as eye redness, discomfort, blurred vision, or a sensation of something being stuck in the eye. The condition may develop due to infections, poor contact lens hygiene, minor eye injuries, or severe dryness of the eyes. The reassuring part is that most cases respond well to early
diagnosis and timely treatment. Recognizing persistent symptoms and seeking prompt medical care can help prevent complications and support healthy vision.
What is Keratitis?
In medical terms, Keratitis refers to inflammation of the cornea. Since the cornea plays a critical role in focusing vision, even minor swelling or damage can interfere with visual clarity.
Keratitis is generally classified into two major categories:
- Infectious Keratitis
- Non-infectious Keratitis
Infectious forms occur when bacteria, viruses, fungi, or parasites invade the corneal tissue. Non-infectious forms are usually linked to trauma, excessive contact lens wear, dry eyes, or environmental exposure. Regardless of the cause, untreated corneal inflammation can lead to scarring, corneal ulcers, and permanent vision loss.
Types of Keratitis
Infectious Keratitis
This form develops when microorganisms penetrate the corneal surface. Contact lens users are particularly vulnerable, especially when hygiene practices are inadequate.
Bacterial Keratitis
Bacterial keratitis is often caused by organisms such as Staphylococcus and Pseudomonas. These infections can develop rapidly and may become severe within a short time. Poor contact lens
hygiene remains one of the leading causes.
Viral Keratitis
Viral infections are commonly linked to the herpes simplex virus (HSV). In some cases, the virus may remain inactive in the body and reactivate later, repeatedly affecting the eye.
Fungal and Parasitic Keratitis
These are less common but potentially sight-threatening. They may occur after injuries involving plant material or exposure to contaminated water sources, particularly while wearing contact lenses.
Non-Infectious Keratitis
Not every case of Keratitis is caused by infection. Inflammation can also result from:
- Corneal scratches or minor trauma
- Excessive ultraviolet light exposure
- Severe dry eye syndrome
- Long-term use of contact lens
- Exposure to irritants or chemicals
Overusing contact lenses can deprive the cornea of oxygen, leading to inflammation even without an active infection.
Causes of Keratitis
The cornea is naturally protective, but certain factors can weaken its defense system. Common causes of Keratitis include:
- Poor contact lens hygiene
- Using contaminated lens solution or tap water
- Wearing lenses while swimming or sleeping
- Eye injuries and corneal abrasions
- Viral infections
- Reduced immunity
- Chronic dry eye disease
- Vitamin A deficiency
Even a small scratch on the cornea can create an entry point for microorganisms, increasing the risk of a corneal infection.
Symptoms of Keratitis: When to Seek Medical Help
Early recognition is essential because Keratitis can worsen quickly. Common symptoms include:
- Severe eye pain or irritation
- Redness in one or both eyes
- Blurred or hazy vision
- Excessive tearing
- Thick eye discharge
- Sensitivity to light (photophobia)
- Persistent foreign body sensation
- Difficulty keeping the eye open
Any sudden combination of redness, pain, and vision changes should be treated as an emergency and evaluated immediately by an ophthalmologist.
Risk Factors for Keratitis
While anyone can develop Keratitis, certain factors significantly increase the risk.
Contact Lens Use
Extended wear of contact lenses is one of the major risk factors, especially when lenses are worn overnight or exposed to water. Use of expired lens solutions and poor cleaning practices can also make it more likely to develop a corneal infection. Chronic Dry Eyes
The cornea is covered and protected by a healthy tear film from irritation and eye infection. This natural defense mechanism is diminished with severe dryness. If lubrication is not provided, the eye surface is more prone to inflammation and discomfort.
Previous Eye Surgery
Individuals who have undergone eye surgery may have temporary disruption of the corneal
surface during healing. Following post-surgical care instructions carefully is important to reduce the risk of irritation or infection.
Long-Term Steroid Use
Corticosteroid eye drops can weaken local immunity, making infections more likely. Prolonged or unsupervised use of steroid medications may also delay healing of the corneal surface.
How Keratitis is Diagnosed
At Aarya Eye Care, diagnosis begins with a detailed clinical examination using a slit-lamp microscope. This specialized instrument allows the ophthalmologist to evaluate the cornea under high magnification and determine the depth and severity of inflammation.
Additional tests may include:
- Visual acuity testing
- Fluorescein staining to detect corneal damage
- Corneal scraping for laboratory analysis
- Microbial culture testing in severe infections
Identifying the exact cause helps ensure targeted and effective treatment.
Keratitis Treatment
Medications
Treatment depends entirely on the underlying cause.
- Bacterial Keratitis: Intensive antibiotic eye drops
- Viral Keratitis: Antiviral medications or ointments
- Fungal Keratitis: Specialized antifungal therapy
- Inflammatory Cases: Lubricating drops and supportive medications
In moderate to severe infections, eye drops may need to be used frequently in the initial stage to control the infection and prevent progression.
Supportive Care and Recovery
Successful recovery also depends on proper supportive care. Patients are advised to:
- Stop wearing contact lenses immediately.
- Avoid rubbing the eyes
- Protect the eyes from bright light
- Follow medication schedules strictly
- Maintain careful hand hygiene
Recovery time varies depending on the severity and type of infection.
Complications of Untreated Keratitis
Delaying treatment can lead to some consequences.
Potential complications include:
- Corneal ulcers
- Permanent corneal scarring
- Chronic blurred vision
- Corneal thinning
- Vision loss
- Need for corneal transplantation
In severe cases, infection can spread deeper into the cornea and permanently compromise visual function.
Frequently Asked Questions
Can Keratitis affect vision?
Yes. Keratitis is considered an ocular emergency because it directly affects the cornea, which is essential for clear vision. Early treatment greatly improves outcomes.
Can contact lenses cause Keratitis?
Contact lenses themselves are generally safe. However, poor hygiene, overnight wear and improper storage practices significantly increase the risk of infection.
Is Keratitis contagious?
The inflammation itself is not contagious, but some underlying viral or bacterial causes can spread through direct contact.
How long does Keratitis take to heal?
Mild cases may recover within a week, while severe infections can require several weeks or even months of treatment and follow-up care.
Conclusion
Keratitis is a condition that affects the cornea and may develop due to infections, improper contact lens hygiene, eye injuries, or severe dryness of the eyes. Symptoms such as persistent redness, pain, watering, blurred vision, or sensitivity to light should not be ignored, especially when they continue to worsen or affect daily comfort.
Early diagnosis and the right treatment can effectively manage the condition of Keratitis. Timely medical attention, proper eye hygiene, and safe contact lens practices play an important role in protecting long-term eye health and preventing complications.
