For a garden-variety eye infection like pink eye, your primary care doctor or an optometrist can usually get you sorted out. These providers diagnose and treat common conjunctivitis every day. But eye infections span a wide range, from a mildly irritating eyelid crust to a sight-threatening corneal ulcer, and the right provider depends heavily on what’s actually going on. Picking the wrong starting point can mean delayed treatment and, in rarer cases, permanent vision loss.
When Your Primary Care Doctor or Optometrist Is a Reasonable First Stop
The most common eye infection people deal with is conjunctivitis, the red, goopy eye that spreads through daycares and offices every year. For straightforward cases, both primary care doctors and optometrists can examine you, make a diagnosis, and prescribe antibiotic drops if bacteria are the likely cause. A UK survey found that common, non-sight-threatening conditions such as blepharitis and dry eye were routinely managed by the vast majority of optometrists, with over 70% handling those conditions regularly.1PubMed. A survey of the scope of therapeutic practice by UK optometrists and their attitudes to an extended prescribing role Lubricants and anti-allergy drops were commonly recommended, though fewer optometrists prescribed antibiotics directly.
Primary care doctors have the advantage of being a familiar entry point for most people. They can use basic tools like a penlight, a magnifying lens, and fluorescein dye to assess whether the surface of your eye is intact. In many cases, that is enough information to treat you or decide you need a referral. The tricky part is that the clinical picture of eye infections is genuinely confusing, even for trained professionals. Viral, bacterial, and allergic forms of conjunctivitis overlap in appearance, which contributes to a high rate of misdiagnosis and antibiotic overuse.2PubMed Central. Differentiating Urgent and Emergent Causes of Acute Red Eye for the Emergency Physician If your infection is mild, this ambiguity is usually harmless. If it’s something more serious disguised as simple pink eye, it matters a lot.
The Misdiagnosis Problem and Why It Matters
Here is an uncomfortable reality: non-ophthalmologists get eye diagnoses wrong fairly often. A large Australian study found that general practitioners gave a correct initial diagnosis for only about 36% of patients they referred to an eye hospital. Emergency department doctors were right about 42% of the time, and optometrists about 48%.3Medical Journal of Australia. Who should I see for an eye infection? A Canadian study at an emergency eye clinic showed similar patterns, with optometrist referral diagnoses correct 54% of the time compared to 39% for emergency physicians and 33% for GPs. Ophthalmologists in that study hit 83% accuracy.4Canadian Journal of Ophthalmology. Accuracy of referral diagnosis to an emergency eye clinic
A broader review confirmed that optometrist referral accuracy was roughly 19 percentage points higher than that of general medical practitioners, though the two groups tended to refer different types of eye conditions.5PubMed Central. Assessment of optometrists’ referral accuracy and contributing factors: A review Across single-centre studies, roughly one-third of referrals to eye hospitals carry an incorrect initial diagnosis, which can delay proper treatment of vision-threatening conditions.6BMJ Open Ophthalmology. Accuracy of ophthalmic referral diagnoses by non-ophthalmologists in acute eye care: protocol for a systematic review and meta-analysis
The most dangerous misdiagnosis pattern is calling something “conjunctivitis” when it is actually iritis, a painful inflammation inside the eye. In the Australian study, 19% of patients who had iritis were misdiagnosed as having conjunctivitis and treated with topical antibiotics, which do nothing for the real problem. Less than a third of iritis cases were correctly identified by the referring provider.3Medical Journal of Australia. Who should I see for an eye infection? The practical lesson: if you visit a primary care doctor or optometrist and the treatment they give you doesn’t work within a few days, don’t assume the infection is just stubborn. The diagnosis itself may be wrong, and you should ask for a referral.
When You Need an Ophthalmologist
An ophthalmologist is a medical doctor who specializes in the eye, has access to specialized imaging and microscopy equipment (like a slit lamp), and can perform surgery. For mild conjunctivitis, seeing one would be overkill. But for anything involving the cornea, the interior of the eye, or an infection that isn’t responding to initial treatment, an ophthalmologist is the right call. Conditions that typically require one include corneal ulcers, deep or widespread herpes simplex eye infections, fungal keratitis, and endophthalmitis (an infection inside the eye).
Severe conjunctivitis and any corneal infection warrant aggressive management, often including cultures to identify the pathogen and targeted antimicrobial therapy.7PubMed. Common ocular infections. A prescriber’s guide Primary care doctors rarely have the equipment or the microbiology workflow to obtain corneal cultures. If your doctor suspects a corneal ulcer or if you have significant pain, blurred vision, or a white spot on the cornea, the right move is a prompt ophthalmology referral rather than a trial of antibiotic drops.
Corneal ulcers from contact lens wear illustrate why speed matters. A delay in diagnosing and starting antimicrobial therapy can cause permanent blindness, and early referral to an ophthalmologist is the clearest way to prevent visual loss.8PubMed Central. Contact lens related corneal ulcer These infections can progress over hours, not days.
Red Flags That Should Send You Straight to the Emergency Room
Most eye infections do not need an emergency department visit, and frankly, the ED is not ideal for nuanced eye diagnosis. But some situations are urgent enough that waiting for a scheduled appointment could cost you your vision. Go to the ER or an emergency eye service if you experience any of the following:
- Sudden vision loss: any rapid drop in how well you can see, especially in one eye.
- Severe eye pain: intense, deep aching rather than mild irritation or itching.
- White spot on the cornea: visible to the naked eye, this can indicate a corneal ulcer.
- Eye injury with signs of infection: trauma followed by redness, swelling, or discharge.
- Recent eye surgery with new symptoms: any redness, pain, or vision changes within weeks of a procedure.
- Chemical exposure: even if secondary infection isn’t yet present, the eye needs immediate irrigation and assessment.
Emergency physicians are not eye specialists, and their diagnostic accuracy for eye conditions is lower than that of optometrists and ophthalmologists. But emergency departments can stabilize urgent situations, start treatment, and arrange rapid ophthalmology consultation. If you’re not sure whether your situation is an emergency, err on the side of being seen sooner. Vision loss from an untreated infection is often irreversible, and the window for effective treatment can be narrow.
Contact Lens Wearers Face Higher Stakes
If you wear contact lenses and develop an eye infection, take it more seriously than you otherwise might. Contact lens wear is the single biggest risk factor for corneal infections in developed countries. The annual incidence of contact-lens-associated keratitis is roughly 2 to 4 per 10,000 wearers, with bacteria responsible in about 90% of cases.9PubMed Central. Contact Lens–Associated Keratitis—an Often Underestimated Risk That may sound small, but the consequences can be severe, and the rarer infections caused by organisms like Acanthamoeba and Fusarium are especially hard to treat.
Acanthamoeba keratitis is strongly linked to contact lens use, which accounts for up to 95% of reported cases.10PubMed Central. How Could Contact Lens Wearers Be at Risk of Acanthamoeba Infection? A Review Key risk factors include rinsing or cleaning lenses with tap water, swimming or showering in lenses, and napping with lenses in.11PubMed. Risk factors for acquisition and severity of Acanthamoeba and Fusarium keratitis in contact lens users-A case-control and clinical-epidemiological study, 2009-2020 In a nationwide study, 95% of Acanthamoeba keratitis patients were contact lens wearers, and about 39% met criteria for treatment failure. Early referral to a cornea specialist was associated with better outcomes.12PLoS ONE. The rising incidence of Acanthamoeba keratitis: A 7-year nationwide survey and clinical assessment of risk factors and functional outcomes
The practical takeaway for contact lens wearers: if you develop redness, pain, light sensitivity, or blurry vision, remove your lenses immediately and see an eye care professional that same day. Do not put the lenses back in. Do not assume it will go away. And if your primary provider suspects keratitis rather than simple conjunctivitis, ask for a same-day or next-day ophthalmology referral rather than waiting to see if antibiotic drops help. A general practice doctor may not have the slit lamp needed to distinguish early keratitis from conjunctivitis, and the difference between the two can be the difference between a week of drops and months of specialized treatment.
The Steroid Trap
One reason ophthalmologist involvement matters for serious infections is the risk of inappropriate steroid use. Steroid eye drops are commonly prescribed for inflammation, and they work well in many contexts. But in fungal keratitis, corticosteroids can be genuinely dangerous. Animal studies have consistently shown that steroids promote fungal growth in the cornea when used without antifungals, and some experimental models actually require steroid application to establish a fungal infection in the first place.13PubMed Central. Steroids in the management of infectious keratitis Human observational studies have also found that steroid use before a correct diagnosis of fungal keratitis is linked to worse outcomes.
In a case-control study of contact-lens-related Acanthamoeba keratitis, corticosteroid eye drops given prior to diagnosis were associated with nearly four times the odds of treatment failure.11PubMed. Risk factors for acquisition and severity of Acanthamoeba and Fusarium keratitis in contact lens users-A case-control and clinical-epidemiological study, 2009-2020 The problem is that a non-specialist who suspects an allergic or inflammatory cause may prescribe steroids before the true infection is identified. An ophthalmologist, by contrast, is more likely to obtain cultures first and withhold steroids until the pathogen is known. This is exactly the kind of decision where seeing the right provider up front can change your outcome.
Can a Pharmacist Help?
Pharmacists are increasingly involved in triaging minor health conditions, and for simple, self-limiting eye infections, a community pharmacist can be a reasonable first contact, especially if you can’t get a same-day doctor appointment. A review of pharmacist triage studies found that when pharmacists used a guideline or protocol, their accuracy in identifying the presenting condition was high, with concordance rates reaching 70% to nearly 98% when compared to medical expert assessments.14PubMed Central. Is there potential for the future provision of triage services in community pharmacy? Without structured protocols, though, pharmacist questioning was often deemed insufficient.
In practice, a pharmacist can help you decide whether your symptoms warrant a doctor visit, suggest over-the-counter lubricants or antihistamine drops for allergic irritation, and in some jurisdictions supply certain antibiotic eye drops without a prescription. What a pharmacist cannot do is examine your eye with any diagnostic equipment, check your cornea for ulceration, or measure the pressure inside your eye. If your symptoms include pain, blurred vision, or significant swelling, a pharmacist should be directing you to a doctor or emergency service rather than recommending a product.
Telehealth and Its Limits for Eye Infections
Virtual visits exploded during the pandemic, and for some health concerns they work well. Eye infections are not among them. The fundamental problem is that diagnosing eye conditions depends heavily on visual inspection at close range, and a phone or laptop camera simply cannot replicate what a clinician sees with a penlight, let alone a slit lamp. Studies of telemedicine for eye complaints have found that remote diagnostic accuracy for symptoms like eye pain, redness, and blurry vision hovers around 45% to 60%, well below what you’d expect from an in-person exam.
A study comparing video triage to in-person triage for emergency eye cases found that while there was no difference in rates of actual harm between the two methods, patients seen via video had statistically higher rates of potential harm, meaning that clinicians reviewing the cases identified more scenarios where something could have gone wrong.15The Lancet Digital Health. Safety of video-based telemedicine compared to in-person triage in emergency ophthalmology during COVID-19 The reassuring part is that no actual harm resulted in that study. But the finding underscores that telehealth for eye problems is a workaround, not a substitute. If the only option available to you tonight is a telehealth visit, it’s better than nothing. But plan to follow up in person if symptoms don’t resolve quickly.
Newborns and Immunocompromised Patients
Two groups deserve special mention because the rules change for them. In newborns, any eye discharge within the first four weeks of life should be taken seriously. Neonatal conjunctivitis can be caused by bacteria acquired during delivery, including organisms like chlamydia and gonorrhea that can damage the eye rapidly. If the conjunctiva is red, a same-day referral to a hospital eye service is recommended.16The BMJ. Approach to conjunctivitis in newborns This is not a situation for a wait-and-see approach or over-the-counter drops.
People with weakened immune systems, whether from a genetic condition, medications like chemotherapy or organ-transplant drugs, or conditions like HIV, also face different risks. A registry study of patients with primary immunodeficiency disorders found that among those with ocular problems, the vast majority with infections had conjunctivitis, with Staphylococcus, Haemophilus, and Streptococcus being the most common bacteria isolated.17PubMed Central. Ocular Manifestations in Primary Immunodeficiency Disorders: A Report From the United States Immunodeficiency Network (USIDNET) Registry Patients with a history of eye infections had lower immunoglobulin and B-cell levels, suggesting their immune deficits made them both more susceptible to infection and potentially less able to clear it. If you’re immunocompromised and develop an eye infection, see an ophthalmologist early rather than assuming it will resolve on its own.
Infections After Eye Surgery
Post-surgical eye infections are rare but serious. After cataract surgery, the most feared complication is endophthalmitis, an infection inside the eye. One study at a university-affiliated hospital found an incidence of 0.04% across all cataract surgeries, with the rate slightly higher for one common surgical technique. Among the seven patients who developed it, five had some form of immune compromise, and four had an intraoperative complication. Visual outcomes were split: about half achieved good vision, while the rest were left with severe impairment.18PubMed. Acute-onset endophthalmitis after cataract surgery (2000-2004): incidence, clinical settings, and visual acuity outcomes after treatment
Some post-surgical infections are subtle and slow. Cutibacterium acnes, a skin bacterium, can cause a low-grade, smoldering endophthalmitis that develops weeks or even months after cataract surgery. Symptoms are vague, cultures often come back negative initially, and the condition is easy to miss. A meta-analysis found that surgical treatment involving vitrectomy led to better visual recovery and fewer retreatments compared to antibiotics alone, though it required longer follow-up.19PubMed. Managing Cutibacterium acnes endophthalmitis after cataract surgery: A systematic review and meta-analysis If you’ve had eye surgery recently and notice increasing redness, pain, floaters, or declining vision, contact your surgeon or go to an emergency eye service immediately, even if the symptoms seem mild.
A Word About Over-the-Counter Eye Drops
Many people reach for artificial tears or over-the-counter eye drops at the first sign of irritation, and in most cases that’s perfectly reasonable. But a 2023 outbreak linked to contaminated artificial tear products led to four deaths from bloodstream infections and multiple cases of severe eye infections caused by a carbapenem-resistant strain of Pseudomonas aeruginosa, a type of antibiotic-resistant bacteria that had never been reported in the United States before.20Ophthalmology. Infections from Over-the-Counter Artificial Tears: Implications for Patients and Clinicians This was a freak event involving a specific product and manufacturing failure, not a reason to avoid artificial tears in general. But it is a reminder that even seemingly benign products go directly into your eye, a uniquely vulnerable environment. Stick to well-known brands, check for FDA recall notices if you hear about a contamination event, and throw away any bottle that has been open for more than a month or that looks cloudy.
More broadly, if you’ve been using over-the-counter drops for what you think is a mild infection and it isn’t improving after two or three days, that’s your signal to see a professional. Self-treating with the wrong drops can mask symptoms and delay diagnosis of something more serious. Redness relievers (the drops that “get the red out”) are particularly misleading because they constrict blood vessels and make the eye look better without addressing an underlying infection at all.
How Optometrist Prescribing Is Expanding
The landscape of who can treat your eye infection is shifting. In several countries and a growing number of U.S. states, optometrists have gained prescribing privileges that let them manage more conditions without referring you to an ophthalmologist. In Wales, a study tracking independent prescribing by optometrists from 2020 to 2024 found that corticosteroids, anti-infective agents, and ocular lubricants were the most commonly prescribed drug classes.21PubMed Central. The Rise of Independent Prescribing by Optometrists in Wales 2020-2024: Number of Practices, Drugs and Costs This means that for many infections, an optometrist with prescribing authority can handle the full episode of care, from diagnosis through treatment, without you needing a separate doctor visit.
That said, the expansion has growing pains. A Canadian study found that after gaining prescribing privileges, optometrists prescribed a variety of medications, but current prescribing guidelines were not always followed, with nearly 90% of glaucoma medication prescriptions in one sample failing to adhere to regulations.22PubMed. Drug-prescribing patterns among optometrists and nonophthalmologist physicians at a tertiary care centre in Kingston, Ontario This doesn’t mean your optometrist is doing something wrong; it does mean the system is still working out the boundaries. For a straightforward bacterial eye infection, an optometrist with prescribing privileges is a perfectly good choice. For anything complicated, unusual, or not responding to treatment, the referral pathway to an ophthalmologist remains essential.