Conjunctivitis (Pink Eye)

Introduction

Conjunctivitis, often called pink eye, is an inflammation of the thin tissue covering the white part of the eye and inner eyelids. It is commonly caused by viral conjunctivitis, bacterial conjunctivitis, allergies or irritants.

Many people still ask, “What is conjunctivitis?” It simply refers to swelling and irritation of the conjunctiva, which can lead to redness, tearing, discharge and discomfort.

The condition is highly contagious, depending on the cause, especially in cases of viral conjunctivitis. Early diagnosis and proper treatment help prevent the spread and protect vision.

Signs & Symptoms

Conjunctivitis symptoms vary by cause, but many overlap.

Common signs of conjunctivitis include:

  • Redness or pink appearance of the white part of the eye
  • Watery eyes or excessive tearing
  • Itchiness or irritation, especially in allergic conjunctivitis
  • Sticky or yellow discharge, suggesting bacterial conjunctivitis
  • Crusting of the eyelids, particularly on waking
  • Gritty sensation as if something is in the eye
  • Sensitivity to light (photophobia)
  • Swollen eyelids, especially in cases of severe inflammation

Newborns may also develop conjunctivitis in newborn, which requires urgent medical attention.

Causes & Risk Factors

Many factors can trigger conjunctival inflammation.

Common conjunctivitis causes include:

  • Viruses (most common), including adenovirus, leading to viral conjunctivitis
  • Bacteria, such as Staphylococcus aureus or Streptococcus pneumoniae, cause bacterial conjunctivitis
  • Allergies, especially dust mites, pollen or pet dander
  • Irritants, such as smoke, chlorine or chemical exposure
  • Blocked tear ducts in newborns, leading to neonatal conjunctivitis
  • Contact lens misuse increases the risk of infection
  • Touching or rubbing the eyes, allowing pathogens to spread

Diagnosis

Diagnosis begins with a careful clinical evaluation to confirm conjunctivitis and rule out more serious eye conditions such as keratitis or uveitis. Early and accurate assessment is important because viral conjunctivitis, bacterial conjunctivitis and allergic forms each require different management.

Your specialist will assess symptoms, identify the likely cause and decide whether medication, conjunctivitis eye drops or further testing is needed.

Common diagnostic steps include:

  • Eye examination: Evaluates redness, swelling, discharge and corneal clarity to distinguish between viral, bacterial and allergic causes.
  • Patient history: Reviews recent illnesses, exposure to infected individuals, contact lens use or allergy triggers to identify what causes conjunctivitis in the eye.
  • Fluorescein stain test: Uses a special dye and blue light to detect corneal abrasions, ulcers or involvement beyond the conjunctiva.
  • Swab or culture: Taken when discharge is severe, persistent or when bacterial conjunctivitis is suspected, helping identify the exact organism.
  • Allergy testing: Considered when symptoms such as itching and tearing point to allergic conjunctivitis, especially in recurrent cases.

Accurate diagnosis ensures you receive the appropriate treatment — whether lubricating drops, antihistamines, antiviral support or targeted antibiotics — and helps prevent unnecessary spread, especially when conjunctivitis is contagious.

Types of Conjunctivitis

Conjunctivitis can be categorised by its underlying cause. Understanding the type is essential for choosing the correct treatment. Each form presents differently, spreads differently and may require specific conjunctivitis eye drops or supportive care.

1. Viral Conjunctivitis

  • Highly contagious and commonly associated with upper respiratory infections such as the flu or common cold. 
  • Causes noticeable redness, watery discharge and a gritty or burning sensation. 
  • Symptoms may worsen over several days before improving. It spreads easily in schools, workplaces and households, making early hygiene precautions important.

2. Bacterial Conjunctivitis

  • Produces thick yellow, green or white discharge that may cause eyelids to stick together, especially upon waking. 
  • Often starts in one eye but can quickly spread to the other through touch or shared items. 
  • Requires antibiotic conjunctivitis eye drops to clear the infection and prevent complications. Prompt treatment helps reduce transmission and speed recovery.

3. Allergic Conjunctivitis

  • Triggered by allergens such as dust mites, pollen, pet dander or cosmetics. Typically causes intense itching, tearing and swelling around the eyes. 
  • Often affects both eyes simultaneously and may be seasonal or persistent. 
  • Treatment focuses on antihistamines and avoiding triggers.

4. Irritant-Induced Conjunctivitis

  • Caused by exposure to chemicals, smoke, chlorine from swimming pools or foreign bodies. Symptoms include redness, discomfort and tearing immediately after exposure. 
  • Clears once the irritant is removed and the eye is flushed with clean water. 
  • Medical review is needed if symptoms persist or if chemical exposure was severe.

Viral vs Bacterial Conjunctivitis

Viral conjunctivitis typically causes watery discharge, spreads easily and is often linked to colds or flu. Bacterial conjunctivitis produces thicker, coloured discharge and usually responds quickly to antibiotic eye drops. Because symptoms overlap, proper diagnosis ensures you receive the right treatment and avoid unnecessary antibiotics. Understanding this difference helps specialists prescribe the most effective and appropriate care.

Treatment Options

Treatment depends on the cause and severity. Most patients recover within 7–14 days, though severe viral infections may take longer.

  • Viral conjunctivitis: Usually resolves on its own. Cold compresses and lubricating drops help reduce discomfort.
  • Bacterial conjunctivitis: Treated with antibiotic eye drops to control infection and prevent spread.
  • Allergic conjunctivitis: Managed with antihistamine drops, allergy medication and avoidance of triggers.
  • Irritant conjunctivitis: Requires eye flushing and avoiding the irritant.

Ready to learn what might help you? Learn more about Conjunctivitis Treatments on this treatment page.

Complications

Though usually mild, untreated conjunctivitis can lead to:

  • Corneal infection or ulceration
  • Vision changes due to severe swelling
  • Chronic allergic irritation
  • Infection spreads to the surrounding tissues
  • Permanent scarring (rare but possible with untreated bacterial infections)

Prevention

Simple steps can significantly reduce the spread and recurrence of conjunctivitis:

  • Wash your hands frequently and avoid touching your eyes
  • Avoid sharing towels, makeup or contact lenses
  • Clean contact lenses properly and replace them regularly
  • Reduce exposure to allergens
  • Stay home if you have active viral conjunctivitis to prevent spreading it
  • Keep children with highly contagious cases away from school temporarily

Living With Conjunctivitis

Managing conjunctivitis involves simple daily adjustments to stay comfortable and avoid spreading infection.

Helpful daily strategies:

  • Use lubricating drops to ease dryness and irritation
  • Apply warm or cold compresses depending on comfort
  • Avoid contact lenses until fully recovered
  • Keep pillowcases and towels clean
  • Reduce screen time if eyes feel strained
  • Follow your medication schedule exactly as prescribed

Navigating Conjunctivitis in Singapore

The Problem and Types

Conjunctivitis is commonly seen in clinics due to the spread of viral infections, humid weather and high exposure to environmental irritants. Outbreaks of viral conjunctivitis can occur in schools, workplaces and community settings, spreading rapidly without early control.

Identifying whether you are dealing with viral, bacterial or allergic conjunctivitis helps ensure the correct treatment is started promptly. Both viral and bacterial conjunctivitis remain the most frequently diagnosed forms. Allergic conjunctivitis in Singapore is also common due to widespread exposure to dust mites and pollen. Early recognition helps prevent unnecessary spread and reduces discomfort.

Consultation to Ongoing Care

Managing conjunctivitis in Singapore typically begins with a visit to a GP or eye specialist who will assess symptoms, examine the eyes and determine whether treatment is needed. Many cases resolve quickly with proper eye drops, hygiene and rest. More serious or persistent cases may require prescription medication or close follow-up.

Ongoing care may involve monitoring for complications, especially in bacterial or severe viral cases. Patients with recurrent allergic conjunctivitis may be advised on allergy management or referred for specialist evaluation.

When to Seek Help

Seek medical attention for conjunctivitis in Singapore if you experience persistent redness, severe discharge, increasing pain or vision changes. These signs may indicate a more serious infection or corneal involvement requiring urgent treatment.

Children, contact lens users and newborns should be evaluated early, as complications can develop quickly. If symptoms worsen despite treatment, consult a specialist promptly to prevent long-term damage.

Find a Conjunctivitis Specialist in Singapore

You do not have to figure out conjunctivitis on your own. An experienced specialist can assess your symptoms, determine the cause and recommend treatment that helps you recover comfortably and safely. Whether you’re unsure if your eye infection is viral conjunctivitis, bacterial conjunctivitis or allergy-related, professional care can guide you toward fast and effective relief.

Get in touch with a conjunctivitis specialist today. You can contact us via WhatsApp to book an appointment or ask any questions.

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