top of page

Conjunctivitis (Pink Eye): Different Types, Contagiousness, and Treatment Options

Conjunctivitis, commonly known as pink eye, is an inflammation or infection of the conjunctiva, the transparent membrane that lines your eyelid and covers the white part of your eyeball. It can cause redness, itching, and tearing in the eyes. While it’s often a minor infection, it can be highly contagious and uncomfortable. This article explores the different types of conjunctivitis, their contagiousness, and available treatment options.

Types of Conjunctivitis
Conjunctivitis can be classified into several types based on the cause:

1. Viral Conjunctivitis

  • Usually caused by adenoviruses, but other viruses like herpes simplex can also be responsible.


  • Watery discharge

  • Redness

  • Itching or burning sensation

  • Light sensitivity


  • Highly contagious

  • Spreads through direct or indirect contact with the eye secretions of an infected person.


2. Bacterial Conjunctivitis

  • Commonly caused by bacteria such as Staphylococcus aureus, Streptococcus pneumoniae, or Haemophilus influenzae.


  • Thick, yellow-green discharge

  • Redness

  • Swelling of the conjunctiva

  • Crusting of the eyelids, especially after sleep


  • Highly contagious

  • Spreads through direct contact with infected secretions or contaminated surfaces.


3. Allergic Conjunctivitis

  • Triggered by allergens like pollen, dust mites, pet dander, or mold.


  • Intense itching

  • Redness

  • Watery or mucous discharge

  • Swelling of the eyelids


  • Not contagious

  • Occurs due to an allergic reaction and not an infection.

4. Chemical Conjunctivitis

  • Exposure to irritants such as chlorine in swimming pools, air pollution, smoke, or chemical fumes.


  • Redness

  • Watery eyes

  • Burning sensation

  • Swelling


  • Not contagious

  • Caused by chemical exposure, not by infectious agents.


Contagiousness of Conjunctivitis
The contagiousness of conjunctivitis depends on its type:

  • Viral and Bacterial Conjunctivitis: Both types are highly contagious. They can spread through direct contact with infected eye secretions, touching contaminated surfaces, or sharing personal items like towels or makeup. Practicing good hygiene, such as frequent handwashing and avoiding touching the eyes, can help prevent the spread.

  • Allergic and Chemical Conjunctivitis: These types are not contagious. They are reactions to allergens or irritants and do not involve infectious agents.

Treatment Options


Viral Conjunctivitis

  • Self-Care: Viral conjunctivitis usually resolves on its own within one to two weeks. Applying a cold compress and using lubricating eye drops can help alleviate symptoms.

  • Avoid Antibiotics: Antibiotics are not effective against viruses and should not be used.


Bacterial Conjunctivitis

  • Antibiotic Eye Drops or Ointments: Prescribed by a doctor to help clear the infection. Improvement is typically seen within a few days of starting treatment.

  • Self-Care: Maintaining good hygiene, cleaning the eyes gently, and avoiding contact with others can help prevent the spread.


Allergic Conjunctivitis

  • Avoiding Allergens: Identifying and avoiding the allergen causing the reaction is crucial.

  • Antihistamine Eye Drops: Over-the-counter or prescription antihistamine eye drops can help relieve symptoms.

  • Cold Compress: Applying a cold compress can reduce itching and swelling.


Chemical Conjunctivitis

  • Rinsing the Eyes: Immediately rinse the eyes with plenty of water if exposed to a chemical irritant.

  • Seek Medical Attention: If symptoms persist or if a strong chemical is involved, seek medical attention promptly.

  • Lubricating Eye Drops: Using lubricating eye drops can help soothe irritation.

Prevention Tips
Preventing conjunctivitis involves good hygiene practices and avoiding known irritants or allergens:

  1. Wash Hands Frequently: Especially after touching the eyes or face.

  2. Avoid Touching the Eyes: Reduce the risk of transferring infectious agents to the eyes.

  3. Do Not Share Personal Items: Towels, makeup, and eye drops should not be shared.

  4. Clean Contact Lenses Properly: Follow proper lens care and replacement schedules.

  5. Protect Eyes from Allergens: Wear sunglasses or goggles in environments with allergens or irritants.

  6. Maintain Cleanliness: Regularly clean surfaces and objects that come into contact with the eyes.

Conjunctivitis, or pink eye, can be uncomfortable and inconvenient, but understanding its types, contagiousness, and treatment options can help manage and prevent it effectively. Maintaining good hygiene and seeking appropriate medical care are key to addressing this common eye condition. If you suspect you have conjunctivitis, consult an eye care professional for a proper diagnosis and treatment plan.

For more information on eye health and to schedule an eye exam at Hillside Optometry in Granada Hills, call us at 818-474-2020, 

bottom of page