Conjunctivitis: Symptoms, Causes, and Care Options

Conjunctivitis is inflammation of the conjunctiva, the thin, transparent membrane that covers the white part of the eye and lines the inside of the eyelids. It can cause noticeable redness, watering, discharge, itchiness, grittiness, and eyelid crusting. The symptoms can feel uncomfortable and disruptive, especially when they begin suddenly or spread between eyes.

This article focuses on conjunctivitis itself: what it is, common causes, warning signs, practical comfort measures, hygiene steps, and when professional assessment may be needed. It is educational general information and should not replace individual advice from your optometrist, General Practitioner (GP), or other qualified health professional.

Key Takeaways

• Conjunctivitis involves inflammation of the conjunctival membrane and may cause redness, discharge, watering, itching, swelling, or a gritty feeling.
• Viral, bacterial, allergic, chemical, environmental, and contact lens-related triggers can all irritate the conjunctiva.
• Some symptoms, including significant pain, light sensitivity, reduced vision, corneal haze, or trauma-related redness, may suggest something more serious than uncomplicated conjunctivitis.
• Practical steps such as hand hygiene, avoiding contact lens wear, using clean compresses, and not sharing towels or cosmetics may help reduce irritation and limit spread.
• If symptoms are severe, persistent, recurrent, or affecting a newborn, arrange prompt clinical advice through an optometrist, GP, or urgent care pathway.

The conjunctiva contains many small blood vessels. When this tissue becomes inflamed, those vessels widen, creating the familiar red or pink appearance associated with conjunctivitis. The inner eyelid surface may also become swollen or bumpy, and the tear film may contain watery, stringy, or thicker discharge depending on the trigger.

Conjunctivitis can be infectious or non-infectious. Infectious forms are usually viral or bacterial, while non-infectious forms may be linked with allergies, smoke, chlorine, cosmetics, dry or dusty environments, or contact lens irritation. Because several eye conditions can look similar at first, symptoms that do not follow a mild, expected course should be assessed rather than assumed to be simple conjunctivitis.

Common Causes of Conjunctivitis

Conjunctivitis occurs when the ocular surface reacts to an infectious organism, allergen, irritant, or mechanical trigger. You can explore All About the Causes of Conjunctivitis for more detail on environmental and biological factors associated with this condition.

Primary Causes of Infectious Conjunctivitis

Infectious conjunctivitis arises when micro-organisms affect the ocular surface. Viral conjunctivitis is commonly associated with adenoviruses and may occur alongside a cold, sore throat, or upper respiratory symptoms. It often begins in one eye before affecting the other eye within several days. Watery discharge, grittiness, mild crusting, and swollen preauricular lymph nodes near the ear may occur.

Bacterial conjunctivitis occurs when bacteria multiply across the conjunctival surface. It may cause thicker yellow, white, or greenish discharge, with eyelids that stick together after sleep. Some bacterial infections are mild, while less common severe forms linked with organisms such as Neisseria gonorrhoeae or Chlamydia trachomatis require prompt medical assessment and GP involvement for appropriate systemic care.

During an active infection, clinical presentations differ depending on the likely cause:

• Viral Presentation: Often watery, gritty, and associated with cold-like symptoms. One eye may be affected first, with the second eye becoming involved soon after.
• Bacterial Presentation: Often produces thicker mucopurulent discharge and more obvious eyelid sticking, especially upon waking.

Managing Allergic Conjunctivitis and Irritants

Non-infectious conjunctivitis is linked with allergic inflammation, environmental exposure, or mechanical irritation rather than contagious infection. Allergic conjunctivitis occurs when the ocular surface reacts to allergens such as grass pollens, weed particles, dust mites, mould spores, or animal dander.

Allergic conjunctivitis commonly causes intense itching, watering, eyelid puffiness, and conjunctival swelling known as chemosis. Symptoms usually affect both eyes and may occur alongside sneezing, allergic rhinitis, or asthma flare-ups.

Mechanical and toxic irritants can also inflame the conjunctiva:

• Chemical and Environmental Exposures: Pool chlorine, cleaning sprays, airborne bushfire smoke, vehicle exhaust fumes, and cosmetic preservatives can irritate the ocular surface.
• Contact Lens Deposits and Friction: Extended wear, poor lens hygiene, or protein deposits can irritate the conjunctiva. In some cases, chronic friction may contribute to giant papillary conjunctivitis (GPC), where larger bumps form under the upper eyelid.
• Environmental Stress: Persistent wind, dry indoor air, and airborne dust can make the ocular surface feel irritated. Following a structured Guide to Healthy Eyes may help support general ocular surface comfort.

Warning Signs That Need Prompt Attention

Many mild conjunctivitis episodes cause surface irritation, watering, discharge, itchiness, or crusting without deeper eye involvement. However, some symptoms may indicate corneal disease, intraocular inflammation, acute glaucoma, injury, or another condition that needs urgent assessment.

Seek prompt clinical advice if conjunctivitis-like symptoms occur with any of the following warning signs:

• Marked light sensitivity: Significant discomfort in normal light or pain when light is shone into either eye.
• Moderate-to-severe eye pain: Deep, aching, throbbing, or nauseating pain is not typical of simple conjunctivitis.
• Reduced or persistent blurred vision: Blur that does not clear with blinking, wiping discharge away, or using lubricating drops should be assessed.
• Corneal haze or visible surface defect: Any cloudy patch, white spot, scratch, ulcer-like area, or foreign body sensation that feels severe needs urgent review.
• Unequal or abnormal pupils: A pupil that looks irregular, unusually large, or poorly responsive to light may suggest a more serious problem.
• Recent trauma, chemical exposure, or eye surgery: Redness after injury, harsh chemical contact, or a recent procedure should be treated as urgent.

If you observe any of these warning signs, prompt clinical review is important. You can access urgent support through our Emergency Eye Care Perth pathway. Reliable public health advice is also available via the Healthdirect Australia guidance on conjunctivitis.

Clinical Feature	Viral Conjunctivitis	Bacterial Conjunctivitis	Allergic Conjunctivitis
Primary Symptom	Gritty, sandy burning sensation	Moderate grittiness, heavy gumminess	Intense, persistent ocular itching
Discharge Consistency	Clear, watery, occasionally serous	Thick, mucopurulent (yellow/white/green)	Stringy, ropy, or clear mucoid tears
Eye Involvement	Starts unilateral, rapidly spreads bilateral	Often unilateral, can become bilateral	Usually bilateral simultaneously
Eyelid Sticking	Mild crusting in the morning	Eyelids glued shut upon waking	Minimal crusting; prominent eyelid puffiness
Conjunctival Reaction	Follicular response may be seen	Papillary response may be seen	Papillary reaction and chemosis may occur
Preauricular Nodes	May be swollen and tender	Rarely involved	Usually absent
Systemic Symptoms	Cold, runny nose, sore throat	Occasional ear or sinus congestion	Sneezing, allergic rhinitis, asthma flare

Conjunctivitis in Children and Newborns

Children can develop conjunctivitis after viral or bacterial infections, allergy exposure, or irritation from the environment. Because children often touch their faces, share toys, and spend time in close contact at school or daycare, infectious conjunctivitis can spread quickly through households and classrooms.

Bacterial conjunctivitis may occur more frequently in young children than in adults and can appear alongside ear or sinus symptoms. Parents may notice eyelids stuck together after sleep, thicker discharge, or redness that returns soon after cleaning. Children should avoid rubbing their eyes, sharing towels, or returning to group settings while active discharge is still present.

In neonates, meaning infants within the first 28 days of life, conjunctival inflammation is called ophthalmia neonatorum. This needs prompt medical assessment. Newborn conjunctivitis may be related to a blocked tear duct, irritation, or bacterial infection acquired around birth.

If an infant develops swollen eyelids, discharge, or eye redness within the first month, parents should arrange prompt review with a GP, paediatric specialist, or urgent medical service to help protect developing vision.

Practical Management and Infection Control

Management depends on the likely trigger, symptom severity, contact lens use, age, and whether any warning signs are present. Therapeutic treatments require assessment by an endorsed optometrist, because not all optometrists hold therapeutic endorsement. Your optometrist will assess whether supportive care, lubricants, anti-allergy drops, antibiotic drops, GP referral, or ophthalmologist referral is appropriate.

For viral conjunctivitis, supportive comfort care is commonly used while the infection runs its course:

• Cool Compresses: Placing a clean, damp cloth soaked in cool water over closed eyelids for 10 minutes may help soothe irritation and reduce grittiness.
• Lubricating Eye Drops: Preservative-free artificial tears may help dilute inflammatory debris and improve surface comfort.
• Contact Lens Cessation: Stop wearing contact lenses at the first sign of redness, discharge, or discomfort. Wear spectacles until the eye has fully settled and your optometrist confirms it is safe to resume contact lens wear.

For bacterial cases, an endorsed optometrist will assess whether topical antibiotic drops or ointments are indicated. Mild bacterial presentations may settle with good eyelid hygiene, but targeted drops may be recommended when clinically appropriate. If systemic symptoms are present, referral to a GP for oral management may be arranged. Surgical matters or deeper internal complications are referred to an ophthalmologist for specialist medical management.

For allergic presentations, management focuses on reducing allergen exposure and calming surface inflammation:

• Cold Compresses: Cool temperatures may help calm swelling and reduce itching.
• Topical Anti-Allergy Drops: An endorsed optometrist may recommend dual-action antihistamine and mast cell stabilising eye drops when appropriate.
• Environmental Controls: Protective spectacles outdoors, high-efficiency particulate air (HEPA) filters indoors, and washing hair before bed may help reduce pollen exposure.

Infection Control and Prevention Measures

Preventing cross-contamination between eyes and reducing spread to family members, colleagues, and classmates relies on careful hygiene habits:

• Wash your hands thoroughly with soap and warm water for at least 20 seconds before and after touching your face or applying eye drops.
• Use clean facial tissues to gently wipe away ocular discharge, wiping once from the inner corner outwards, and dispose of the tissue immediately in the bin.
• Avoid touching or rubbing your eyes, as rubbing can worsen irritation and transfer micro-organisms to your fingertips.
• Never share towels, face washers, pillowcases, spectacles, or cosmetics with household members.
• Launder bed sheets, pillowcases, and bath towels in hot water and detergent during and after an active infection.
• Safely discard eye makeup, mascara wands, eyeliner pencils, and cosmetic sponges used just before or during an active eye infection.
• Contact lens wearers should discard their current pair of lenses, disposable cases, and opened bottles of contact lens solution before resuming wear.

Support for Conjunctivitis Symptoms

If you are experiencing conjunctivitis symptoms, persistent discharge, worsening irritation, or any warning signs, you can Book an Eye Test with our team or Contact Us to ask about the most appropriate next step.

Frequently Asked Questions About Conjunctivitis

How long does infectious conjunctivitis usually last?

The duration of an eye infection depends on the causative organism. Most uncomplicated viral conjunctivitis cases resolve within 7 to 14 days as the body’s immune system clears the virus, although more aggressive adenoviral strains can occasionally cause ocular irritation for 3 to 4 weeks. Bacterial conjunctivitis typically shows noticeable improvement within 2 to 5 days of starting appropriate hygiene or topical care, usually clearing completely within 7 to 10 days. If your symptoms do not begin to improve after several days of supportive management, a follow-up assessment with your optometrist is recommended.

Can contact lenses be worn during active conjunctivitis?

No, contact lens wear must be discontinued immediately if you experience eye redness, discharge, or discomfort. Wearing contact lenses over an inflamed or infected conjunctiva creates a warm, moist environment that traps micro-organisms against the cornea. This may increase your risk of developing a severe corneal infection or microbial keratitis.

You should wear your spectacles exclusively until your optometrist confirms that the conjunctiva has fully settled. Once recovered, start with a brand-new pair of contact lenses, a fresh lens storage case, and a newly opened bottle of disinfecting solution.

When is conjunctivitis considered urgent?

Conjunctivitis-like symptoms need urgent clinical attention whenever surface irritation is accompanied by warning signs affecting deeper eye structures. Seek urgent clinical care if you experience moderate-to-severe eye pain, marked sensitivity to light, persistent blurred vision that does not clear with blinking, unequal pupils, extreme swelling, or redness after eye trauma, chemical exposure, or recent eye surgery. These signs may suggest conditions such as keratitis, acute glaucoma, or anterior uveitis that need immediate assessment and referral to an ophthalmologist.