Red eyes, excessive tearing, and eye irritation are common symptoms that many people experience. One of the most frequent causes is viral conjunctivitis, an infection that affects the conjunctiva, the thin membrane covering the white part of the eye and the inner surface of the eyelids.

Viral conjunctivitis can spread easily through direct contact with infected eye secretions, contaminated hands, or shared personal items. Although most cases improve on their own, proper eye care is important to reduce discomfort and prevent transmission to others.

What Is Viral Conjunctivitis?

Viral conjunctivitis is inflammation of the conjunctiva, the transparent layer of tissue that covers the sclera (white part of the eye) and lines the inside of the eyelids.

When the conjunctiva becomes inflamed, the small blood vessels in the eye become more visible, causing the eye to appear red or pink. This is why the condition is commonly known as “pink eye.”

Several types of viruses can cause viral conjunctivitis. The most common cause is adenovirus, which may occur along with symptoms of a cold or respiratory infection. Other viruses, such as herpes simplex virus and varicella-zoster virus, can also cause conjunctivitis.

Why Viral Conjunctivitis Should Be Taken Seriously

Although viral conjunctivitis is usually not a serious condition and often resolves naturally, it is highly contagious and can spread quickly within families, schools, workplaces, and communities.

In some cases, especially infections caused by certain viruses, inflammation may extend to the cornea and affect vision. Therefore, recognizing warning signs and receiving appropriate medical evaluation when needed are important.

Causes and Risk Factors

The main causes and risk factors associated with viral conjunctivitis include:

Viral Infection
The condition occurs when viruses infect the conjunctiva. Adenovirus is the most common cause and is often associated with upper respiratory tract infections.

Contact With Infected Secretions
The virus can spread through contact with:

• Tears
• Eye discharge
• Respiratory secretions

Touching Contaminated Objects
The infection may spread through contaminated items such as:

• Towels
• Handkerchiefs
• Cosmetics
• Personal eye-care products

Touching the Eyes With Contaminated Hands
Rubbing or touching the eyes after contact with contaminated surfaces can introduce viruses into the eye.

Symptoms of Viral Conjunctivitis

Common symptoms include:

• Redness of the eye
• Excessive tearing
• Eye irritation or a feeling of having something in the eye
• Mild swelling of the eyelids
• Clear or watery eye discharge
• Symptoms that begin in one eye and spread to the other eye
• Cold-like symptoms such as sore throat or runny nose

Compared with bacterial conjunctivitis, viral conjunctivitis usually produces watery discharge rather than thick, pus-like discharge.

When Should You See a Doctor?

Medical attention should be sought if you experience:

Diagnosis

Doctors usually diagnose viral conjunctivitis through:

• Medical history evaluation
• Eye examination
• Assessment of associated symptoms, such as fever, respiratory symptoms, or recent exposure to infected individuals

Additional tests may be performed in certain cases to distinguish viral conjunctivitis from other types of eye infections.

Treatment and Eye Care

Most cases of viral conjunctivitis improve naturally without specific antiviral treatment. Management focuses on relieving symptoms and preventing spread.

Recommended care includes:

• Using artificial tears to relieve dryness and irritation
• Applying cold compresses to reduce swelling and discomfort
• Avoiding rubbing the eyes
• Avoiding contact lens use until symptoms have completely resolved

Antibiotic eye drops do not treat viral infections and should not be used unless prescribed by a healthcare professional.

For certain viral infections, such as herpes simplex virus infection, doctors may prescribe antiviral medications when appropriate.

How to Prevent the Spread of Viral Conjunctivitis

Because viral conjunctivitis spreads easily, prevention measures include:

• Washing hands frequently with soap and water
• Avoiding touching or rubbing the eyes
• Not sharing towels, cosmetics, or personal items
• Cleaning frequently touched objects such as phones, glasses, and personal devices
• Avoiding close contact with others while symptoms are active

Who Should Consult a Healthcare Professional?

You should consult a doctor if:

• Eye redness does not improve or repeatedly returns
• You experience eye pain, vision changes, or severe light sensitivity
• The patient is an infant, elderly person, or someone with reduced immunity
• You wear contact lenses
• You are uncertain about the cause of eye symptoms

Summary

Viral conjunctivitis is a common eye infection caused by viruses affecting the conjunctiva. It typically causes redness, tearing, irritation, and discomfort, and it can spread easily through contact with infected secretions or contaminated surfaces.

Although most cases resolve naturally, maintaining good hygiene, preventing transmission, and recognizing warning signs are essential. If symptoms such as eye pain, vision changes, or severe inflammation occur, medical evaluation should be considered.

Prepared by: ภญ. ปุณยนุช อังคะนาวิน

References

1. Centers for Disease Control and Prevention (CDC). Conjunctivitis (Pink Eye)
2. National Eye Institute (NEI). Pink Eye Treatment
3. DermNet. Viral Conjunctivitis