Eye Infection: Symptoms, Causes, Treatment and When to Seek Care

Common eye infection symptoms include redness, watering, irritation, a gritty or burning feeling, discharge, crusting around the eyelashes, and swollen eyelids. Conjunctivitis can cause these symptoms in one or both eyes, and the pattern can vary with the cause. Viral infections often produce watery discharge, while bacterial conjunctivitis may produce thicker discharge. Itching is common in allergic conjunctivitis, which is inflammation caused by allergy rather than an infection.

Symptoms alone cannot always tell you which condition you have. Pain, light sensitivity, reduced vision, a very red eye, marked swelling, or symptoms in a contact-lens wearer can suggest a problem involving the cornea or another deeper eye structure. Those features deserve prompt professional assessment. A clinician may examine the eye, ask about contact lenses, injuries, recent illness, exposure to someone with conjunctivitis, and any medicines already used. Avoid assuming that every red eye is a simple infection, because dry eye, allergy, irritation, inflammation, injury, and glaucoma can also cause redness.

Some eye infections, especially uncomplicated viral conjunctivitis, can improve without prescription treatment. The National Eye Institute notes that many cases of pink eye resolve on their own, while symptom relief may include artificial tears and a cool compress. Mild bacterial conjunctivitis can also be self-limited in some cases, although a clinician may prescribe antibiotic drops or ointment when bacterial infection is suspected or when the clinical situation warrants treatment.

The important point is not to use “wait and see” for every red or irritated eye. Seek medical care sooner if you have significant pain, sensitivity to light, blurred or reduced vision that does not clear with blinking, severe swelling, injury, chemical exposure, a foreign body, or worsening symptoms. Contact-lens wearers should be particularly cautious because lens-related infections can affect the cornea and may threaten vision. Newborns with eye discharge or swollen red eyelids need prompt medical review. If symptoms are mild but are not improving as expected, arrange an eye examination rather than repeatedly trying different over-the-counter products.

Viral, bacterial, and allergic conjunctivitis can overlap, so appearance alone is not always reliable. Viral conjunctivitis often follows or accompanies a respiratory illness and commonly causes watery discharge, burning, or gritty discomfort. Bacterial conjunctivitis more often produces thicker pus-like discharge and eyelids that stick together, especially after sleep. Allergic conjunctivitis typically causes prominent itching, watering, and involvement of both eyes, often alongside other allergy symptoms.

These patterns are clues rather than a diagnosis. Antibiotics do not treat viruses or allergies, and unnecessary antibiotic use can expose you to side effects without helping the underlying cause. Likewise, severe pain, light sensitivity, or reduced vision is not typical of uncomplicated conjunctivitis and should prompt an eye examination. Herpes-related eye disease, keratitis, uveitis, and other conditions can initially resemble a red eye but need different treatment. If you wear contact lenses, have had eye surgery, have a weakened immune system, or have recurrent symptoms, professional assessment is especially important before starting medicated drops.

Not every eye infection needs antibiotics. Antibiotic drops or ointments are used for certain bacterial eye infections, but they do not work against viral conjunctivitis and they do not treat allergic irritation. The choice of treatment depends on the affected part of the eye, likely cause, severity, medical history, contact-lens use, and examination findings. Some bacterial conjunctivitis cases are self-limited, while other infections require targeted prescription therapy.

Do not use leftover prescription drops, someone else’s drops, or steroid-containing eye drops without professional advice. Steroids can worsen some infections, including certain herpes infections, and can mask important signs. If a clinician prescribes an antibiotic, use it exactly as directed and complete the recommended course unless the prescriber tells you otherwise. Return for review if symptoms worsen, vision changes, pain increases, or there is no expected improvement. For mild conjunctivitis, cool compresses and lubricating artificial tears may ease discomfort while the underlying condition resolves.

An eye infection needs urgent assessment when it is associated with severe eye pain, marked light sensitivity, sudden or significant loss of vision, a rapidly worsening red eye, major swelling around the eye, inability to open the eye, chemical exposure, penetrating injury, or a suspected foreign body. Contact-lens wearers with a painful red eye or reduced vision also need prompt evaluation because microbial keratitis can progress quickly and damage the cornea.

Urgent assessment is also sensible if redness follows eye surgery, if there are blisters or a rash around the eye, if the pupil looks unusual, or if the person is very unwell. Newborns with eye discharge or puffy red eyelids should be evaluated promptly. Do not delay care by repeatedly testing home remedies when warning signs are present. If you are unsure whether your symptoms are urgent, contact an eye-care professional, medical service, or emergency facility for triage based on your symptoms and local access.

No. Stop wearing contact lenses while you have symptoms of an eye infection or unexplained red eye, and do not restart them until an eye-care professional says it is safe or until the condition has fully resolved according to the advice you were given. The CDC advises people with pink eye to stop wearing contacts, and the National Eye Institute identifies contact-lens-related infection as a major cause of keratitis.

If you develop pain, redness, light sensitivity, discharge, or reduced vision while wearing lenses, remove them and seek prompt eye care rather than putting them back in after a short break. Depending on the situation, your clinician may advise replacing disposable lenses, the lens case, and potentially other products that could have been contaminated. Follow proper hand hygiene, lens cleaning, replacement schedules, and overnight-wear instructions. Never use tap water or saliva to wet contact lenses. Lens-related corneal infection is different from ordinary irritation and can become serious quickly, so do not self-treat a painful contact-lens red eye with leftover drops.

If the infection is contagious, careful hygiene reduces spread. Wash your hands with soap and water before and after touching the face or eyes. Avoid rubbing the affected eye, and do not share towels, washcloths, pillowcases, cosmetics, eye drops, contact lenses, or lens cases. Clean discharge gently using clean materials and wash linens that have been in close contact with the face.

The CDC notes that viral and bacterial conjunctivitis can spread readily. Avoid touching the tip of an eye-drop bottle to the eye, lashes, fingers, or other surfaces because this can contaminate the bottle. If only one eye is affected, be especially careful not to transfer discharge to the other eye. Follow school, workplace, healthcare, or clinician guidance about attendance because exclusion rules differ by setting and cause. Good hand hygiene matters more than trying to sterilize every object in the home. If several household members develop symptoms, consider contacting a clinician for advice about the likely cause and any additional precautions.

For mild conjunctivitis without warning signs, simple comfort measures may help. A clean cool compress can reduce irritation and swelling, and preservative-free or standard artificial tears may relieve dryness or grittiness. Gently clean crusting from the eyelids with clean water and fresh cotton or a clean cloth, using a separate area of the cloth for each pass. Rest from contact lenses and avoid eye makeup until symptoms have resolved.

Home care should not include homemade eye drops, herbal liquids, breast milk, saliva, or non-sterile solutions placed in the eye. Do not use redness-relief drops excessively, and do not start steroid or antibiotic drops left over from another illness. If symptoms are worsening, painful, associated with light sensitivity or vision change, or not improving within a reasonable period, arrange professional evaluation. A clinician can distinguish conjunctivitis from corneal infection, eyelid infection, allergy, dry eye, foreign-body injury, or other causes of a red eye.

Duration depends on the cause. Viral conjunctivitis can last from several days to a couple of weeks, and some viral cases may take longer to settle completely. Acute bacterial conjunctivitis is often self-limited within about one to two weeks, though treatment can change the course in selected cases. Allergic conjunctivitis may persist or recur as long as exposure to the trigger continues, but it is not an infection. Corneal infections, herpes-related disease, and deeper eye infections have different timelines and require individualized treatment.

Rather than relying only on a calendar, watch the direction of change. Symptoms should generally move toward less redness, less discharge, and better comfort. Worsening pain, new light sensitivity, reduced vision, increasing swelling, or failure to improve should trigger reassessment. If you were prescribed medication, follow the schedule and review instructions you received. Contact-lens wearers should not resume lenses merely because a certain number of days has passed; wait until the eye has recovered and it is safe to restart them.

Most uncomplicated conjunctivitis does not cause permanent vision loss, but some infections can threaten sight when they involve the cornea or deeper tissues. Keratitis is inflammation of the cornea and can be caused by infection; the National Eye Institute notes that contact-lens-related infections are a common cause. Ocular herpes can also affect the cornea and may lead to scarring and vision loss if it becomes more severe.

This is why pain, light sensitivity, reduced vision, and a contact-lens-associated red eye are treated differently from mild itching or discharge. Prompt diagnosis allows the clinician to identify whether the cornea is involved and choose appropriate antimicrobial or antiviral treatment when needed. Do not cover a painful red eye with an eye patch unless a clinician specifically recommends it, and do not use steroid drops without supervision. If vision is suddenly reduced or symptoms are rapidly worsening, seek urgent eye care rather than waiting for a routine appointment.