Conjunctivitis

Conjunctivitis is a common eye condition that affects people of all ages (Azari et al., 2020). It occurs when the conjunctiva becomes inflamed, causing discomfort and a characteristic pink or red appearance in the affected eye(s). While conjunctivitis can be bothersome, it is usually a minor eye condition that resolves within a few days to two weeks. However, it is essential to understand the causes, symptoms, and available treatments for this condition to ensure proper management and prevent complications.

What is Conjunctivitis?

Conjunctivitis, often referred to as "pink eye," is an inflammation of the conjunctiva. This condition can affect one or both eyes and is caused by various factors, including viral and bacterial infections, allergies, and exposure to irritants. When the conjunctiva becomes inflamed, the small blood vessels within it become more visible, giving the eye a pink or reddish appearance. Conjunctivitis can cause discomfort, itching, and a gritty sensation in the eye, as well as discharge that may cause the eyelids to stick together, especially after sleep.

The symptoms of conjunctivitis can vary depending on the underlying cause. However, some common signs and symptoms include:

• Redness: One of the most noticeable symptoms is a pink or red discolouration in one or both eyes. This occurs due to the inflammation of the conjunctiva, which makes the blood vessels in the white part of the eye more visible.

• Discharge: Conjunctivitis can cause a discharge or crusting on the eyelids. The nature of the discharge may vary, ranging from clear and watery in viral conjunctivitis to thick and pus-like in bacterial cases.

• Eye irritation: Conjunctivitis often causes itching, irritation, and/or a burning sensation in the eyes, which can be uncomfortable and distracting.

• Tearing: Increased shedding of tears is another common symptom of conjunctivitis, as the eyes try to flush out the irritant or infection.

• Gritty feeling: Some people with conjunctivitis may experience a gritty or sandy feeling in one or both eyes, as if there is something in the eye that cannot be removed.

• Swelling: Swelling of the eyelids is another sign of conjunctivitis, which can make the eyes appear puffy and tired.

• Crusting: Crusting of eyelids or lashes can occur, especially in the morning, which can cause the eyelids to stick together and make it difficult to open the eyes.

• Light sensitivity: Sensitivity to light, known as photophobia, may occur with conjunctivitis, making it uncomfortable to be in bright environments.

• Blurred vision: While rare, blurred vision can occur due to excessive watering or discharge from the eyes, which can interfere with clear sight.

Understanding these symptoms can help individuals recognise conjunctivitis and seek appropriate treatment. However, it is essential to identify the underlying cause to determine the most effective course of action.

Conjunctivitis can be triggered by various factors, each requiring a different approach to treatment. The main causes include:

• Viral infections: Viral conjunctivitis is the most common type of infectious conjunctivitis (Azari et al., 2020). It is often associated with the common cold or other respiratory infections and can be highly contagious. Viruses such as adenovirus and herpes simplex virus are common causes.
• Bacterial infections: Bacterial conjunctivitis is caused by various bacteria, including Staphylococcus aureus, Streptococcus pneumoniae, and Haemophilus influenzae. This type of conjunctivitis is also contagious and can spread rapidly in schools, daycare centres, and other crowded environments.
• Allergies: Allergic conjunctivitis occurs when the eyes react to allergens such as pollen, pet dander, or dust mites. This type of conjunctivitis is not contagious and often occurs seasonally or when exposed to specific allergens.
• Chemical/irritant exposure: Exposure to chemicals, such as chlorine in swimming pools, or irritants, like smoke or air pollution, can cause conjunctivitis. This type of conjunctivitis is also not contagious and usually resolves once the irritant is removed.
• Foreign bodies: Sometimes, a foreign body, such as a loose eyelash or a piece of dust, can become trapped under the eyelid, causing irritation and inflammation of the conjunctiva.
• Autoimmune disorders: Certain autoimmune disorders, such as rheumatoid arthritis and lupus, can cause ocular surface inflammation, including conjunctival involvement, as part of systemic disease.
• Contact lens use: Improper use of contact lenses, such as wearing them for too long or not cleaning them properly, can lead to conjunctivitis by introducing bacteria or irritants to the eye.
• Blocked tear ducts: In infants, blocked tear ducts (nasolacrimal duct obstruction) can cause a mild form of conjunctivitis, as accumulated tears provide an environment that may promote bacterial growth.

Preventing the spread of conjunctivitis is crucial, as it is a highly contagious condition. Here are some key strategies to reduce the risk of infection and transmission:

• Personal hygiene: Maintain good personal hygiene by washing your hands frequently, especially before touching your eyes. This helps reduce the risk of infection significantly.
• Contact lens care: For contact lens wearers, proper lens care is essential. Clean and disinfect your lenses as recommended by your eye care professional. Avoid sharing contact lenses or lens care products. Stop wearing contact lenses until symptoms resolve. Seek urgent medical attention if you experience eye pain, redness, or vision changes, as these may indicate microbial keratitis CDC (2024). 
• Avoiding shared makeup and facial products: Do not share makeup, facial lotions, or eye care products, as this can increase the risk of spreading conjunctivitis. Use only your own products, and if you have conjunctivitis, discard any eye makeup that may have come into contact with the infected eye.
• Environmental precautions: In communal settings like schools or childcare facilities, encourage frequent hand washing and discourage sharing towels or pillows. Clean and disinfect surfaces or objects that may have come into contact with infected individuals to prevent transmission.

By following these preventive measures, you can significantly reduce your risk of developing conjunctivitis or spreading the infection to others. 

Diagnosing conjunctivitis involves a comprehensive eye examination performed by a qualified doctor. The examination typically includes:

• Patient history: Diagnosis begins with a detailed patient history, focusing on symptoms like redness, itching, discharge, and any pain or vision changes. The duration of symptoms and recent exposure to infected individuals or allergens are also assessed.
• Physical examination: A thorough physical examination includes inspecting the eyes for redness, swelling, and discharge. The doctor checks pupil reactions to light and examines the eyelids and conjunctiva for inflammation.
• Visual acuity measurements: Visual acuity measurements are conducted to determine if conjunctivitis has affected vision. This helps assess the impact of the condition on the patient's sight.
• Discharge assessment: The type of eye discharge offers important clues: purulent discharge suggests bacterial conjunctivitis, watery discharge indicates viral conjunctivitis, and clear discharge is typically seen in allergic conjunctivitis.
• Slit-lamp examination: A slit-lamp examination provides a magnified, detailed view of the conjunctival surface. This helps differentiate between various types of conjunctival inflammation and assess the overall health of the eye.
• Fluorescein staining: According to AAO (2023), fluorescein staining highlights corneal epithelial defects and tear-film abnormalities. Detection of anterior chamber inflammation (cells and flare) requires slit-lamp biomicroscopy and cannot be determined by fluorescein staining alone.
• Laboratory tests: Laboratory tests may include swabs of the discharge to identify the specific cause, such as bacterial or viral infection. These tests are not routinely required but may be considered in severe, recurrent, or atypical cases. Allergy testing may be conducted if allergic conjunctivitis is suspected.

Prompt diagnosis and identification of the underlying cause of conjunctivitis are crucial for initiating appropriate treatment and preventing potential complications.

The treatment of conjunctivitis depends on the underlying cause, whether it is bacterial, viral, allergic, or due to irritants. Management includes medications, supportive care, and preventive measures to reduce symptoms and prevent the spread of infection.

1. Antibiotic Therapy for Bacterial Conjunctivitis

• Chloramphenicol and Fusidic Acid are commonly prescribed topical antibiotics that help eliminate bacterial infections and reduce symptoms.
• Ofloxacin, Ciprofloxacin, and Levofloxacin are fluoroquinolone antibiotics used for more severe or resistant bacterial conjunctivitis cases.

2. Antiviral Therapy for Viral Conjunctivitis

• If conjunctivitis is caused by herpes simplex virus, Acyclovir, Valacyclovir, and Ganciclovir may be prescribed to reduce viral replication and shorten the duration of symptoms.

3. Antihistamines and Mast Cell Stabilizers for Allergic Conjunctivitis

• Olopatadine, Azelastine, and Ketotifen are antihistamine eye drops that help reduce itchiness, redness, and swelling caused by allergic conjunctivitis.
• Sodium Cromoglycate and Lodoxamide act as mast cell stabilisers, preventing the release of histamines that trigger allergic reactions.

4. Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) and Corticosteroids

• Ketorolac and Diclofenac are NSAID eye drops that help relieve inflammation and discomfort in non-infectious conjunctivitis.
• Prednisolone, Fluorometholone, and Loteprednol are corticosteroid eye drops used in severe allergic or inflammatory conjunctivitis to reduce swelling and irritation.

5. Lubricating Eye Drops and Supportive Care

• Carboxymethylcellulose, Hydroxypropyl Methylcellulose, and Hypromellose are artificial tear solutions that provide relief from dryness and irritation caused by conjunctivitis.
• Naphazoline and Tetrahydrozoline are decongestant eye drops that help reduce redness and swelling.

6. Hygiene and Preventive Measures

• Avoid touching or rubbing the eyes, as this can worsen the infection or cause it to spread.
• Regular handwashing is essential to prevent the transmission of bacterial or viral conjunctivitis.
• Disinfect personal items such as towels, pillowcases, and makeup products to minimise the risk of reinfection.
• For contact lens wearers, it is recommended to temporarily discontinue use and clean lenses thoroughly before reuse.

Early detection and appropriate treatment of conjunctivitis help reduce discomfort and prevent complications. Always follow the doctor’s advice regarding the correct medication and dosage to ensure a safe and effective recovery.

While mild cases of conjunctivitis may resolve on their own, there are certain situations where contacting your doctor is necessary:

• If your symptoms persist or worsen after a few days of self-care measures

• If you experience severe eye pain, vision changes, or sensitivity to light

• If you have a weakened immune system or other underlying health conditions

• If you develop a high fever along with your conjunctivitis symptoms

• If you notice any pus or mucus discharge from your eye

• If you recently suffered an eye injury or had eye surgery

In these cases, your doctor can provide a proper diagnosis and recommend appropriate treatment options. Timely medical intervention can help prevent complications and ensure a faster recovery from this eye conjunctive infection.

• Conjunctivitis, commonly known as "pink eye," is a highly contagious inflammation of the conjunctiva, the thin, clear tissue covering the white part of the eye and the inner surface of the eyelid.

• Common symptoms of conjunctivitis include redness, itching, tearing, discharge, and crusting of the eyelids, usually affecting one eye initially and spreading to the other.

• Conjunctivitis can be caused by viruses, bacteria, allergies, or irritants, with viral and bacterial conjunctivitis being the most contagious forms.

• Preventive measures such as practicing good hygiene, avoiding touching the eyes, and not sharing personal items can help reduce the risk of contracting or spreading conjunctivitis.

• While conjunctivitis often resolves on its own, it is essential to seek medical attention if symptoms worsen, persist, or are accompanied by severe pain, vision changes, or trauma to the eye.