Most people’s mental model of an eye infection is pink eye — mild, self-limiting, clears up on its own or with a course of antibiotic drops. That model works for the majority of cases. But it completely misses a category of eye infections that are genuine emergencies: corneal ulcers that can permanently scar the cornea within 48–72 hours, herpes simplex keratitis that recurs for life, and acanthamoeba keratitis — an infection nearly unique to contact lens wearers that is notoriously painful, difficult to diagnose, and requires months of intensive treatment.
Knowing which kind you have changes both what you should do and what you’ll spend.
Cost by Infection Type
| Infection Type | Typical Treatment | Cost Range | Emergency? |
|---|---|---|---|
| Bacterial conjunctivitis | Antibiotic drops + exam | $100–$250 | No |
| Viral conjunctivitis | Supportive care + exam | $50–$150 | Rarely |
| Allergic conjunctivitis | Antihistamine drops + exam | $50–$200 | No |
| Herpes simplex keratitis | Antiviral drops/pills + frequent exams | $300–$1,500 | Yes |
| Bacterial corneal ulcer | Intensive antibiotic drops + exams | $500–$3,000 | Yes |
| Fungal keratitis | Antifungal drops + prolonged treatment | $2,000–$10,000 | Yes |
| Acanthamoeba keratitis | PHMB/PTDA drops + extended treatment | $3,000–$15,000 | Yes |
The extreme spread in costs reflects treatment complexity. Bacterial conjunctivitis diagnosed at urgent care: $75–$150 for the visit, $10–$50 for generic antibiotic drops at the pharmacy. Acanthamoeba keratitis requiring 3–12 months of intensive topical antiseptics, multiple specialist visits, and sometimes corneal transplant: $3,000–$15,000 minimum.
Contact Lenses Are the Biggest Risk Factor
The AAO reports that contact lens wearers are up to 10 times more likely to develop microbial keratitis than non-wearers. Prevent Blindness America estimates that contact lens-related infections result in approximately 1 million visits to eye care providers and emergency departments annually — costing the US healthcare system over $175 million per year.
The risk behaviors are well-established: sleeping in lenses, overwearing monthly lenses beyond their replacement schedule, using contaminated lens cases, swimming or showering with contacts in, topping off old solution rather than emptying and refilling.
Each of these is fixable. The infections they cause sometimes aren’t.
Telehealth ($35–$75): Appropriate for classic bacterial conjunctivitis (pink, sticky, crusting discharge) with no contact lens use, no vision change, no significant pain.
Urgent Care ($75–$150): Bacterial conjunctivitis in non-contact wearers; can prescribe antibiotic drops and refer if needed.
Eye Doctor (optometrist/ophthalmologist) ($100–$250): Best for contact lens wearers with any eye infection, anyone with vision change, or any case not clearly resolving in 3–5 days. A slit lamp is needed to rule out corneal involvement.
Emergency Room: True eye emergency — sudden vision loss, chemical splash, penetrating injury, or severe pain not improving. Corneal ulcers in contact lens wearers require same-day evaluation by an eye care specialist, not urgent care.
Herpes Simplex Keratitis: A Recurring Cost
HSV-1 — the virus that causes cold sores — can infect the cornea. The first episode typically presents as a branching, dendritic ulceration on the corneal surface that’s almost diagnostic on slit lamp exam. Antiviral treatment with topical trifluridine or oral acyclovir/valacyclovir resolves the acute episode in 1–2 weeks.
The challenge is that HSV keratitis recurs. The HEDS (Herpetic Eye Disease Study) found 9% of patients had recurrence within 1 year and 50% within 10 years. Repeated episodes cause stromal scarring that gradually reduces vision. Long-term suppressive oral acyclovir ($15–$30/month for generic) reduces recurrence risk by 50%, according to HEDS data.
Each acute episode costs $200–$800 in antiviral medication plus $100–$300 in follow-up visits. Patients with frequent recurrences often end up on indefinite suppressive therapy — $180–$360/year in medication plus regular monitoring.
Never use topical corticosteroid eye drops for a red eye without a clear diagnosis. If the underlying cause is herpes simplex keratitis, steroids can cause catastrophic worsening by suppressing the immune response that’s containing the infection. Steroids do have a legitimate role in specific HSV keratitis presentations (stromal disease), but only under close ophthalmology supervision — not as self-treatment or urgent care empiric therapy.
Fungal and Acanthamoeba Keratitis: The Serious Cases
Fungal keratitis is uncommon but severe. It’s associated with vegetative trauma — plant matter, grass, soil — or contaminated contact lens solutions. The organisms grow slowly and are difficult to identify; diagnosis often requires corneal scraping and culture with specialized media. Treatment means antifungal drops (natamycin is first-line for filamentous fungi; voriconazole for Candida) applied frequently for weeks to months. Hospitalization for intensive therapy is sometimes required.
Acanthamoeba keratitis is almost exclusively a contact lens disease. The organism lives in freshwater, soil, and biofilm — contact lens wearers who swim or shower with lenses in, or who use tap water around their lenses, are at risk. It’s notoriously difficult to diagnose and to treat: PHMB (polyhexamethylene biguanide) and propamidine drops must be applied every few hours initially, sometimes for 3–12 months. Pain is severe and often disproportionate to visible signs in early disease, which is part of why it gets misdiagnosed. In severe cases, corneal transplant is eventually needed.
The $3,000–$15,000 cost range for these infections reflects extended treatment duration, multiple specialist visits, potential hospitalization, and sometimes surgical intervention.
Bottom Line
Simple eye infections cost $100–$250 to treat. Contact lens-related corneal ulcers run $500–$3,000. Fungal and acanthamoeba keratitis cost $3,000–$15,000 and carry real risk of permanent vision loss. The cheapest intervention here is prevention: proper contact lens hygiene, never sleeping in daily-wear lenses, replacing lens cases monthly, and seeing an eye care provider immediately — not urgent care, not telehealth — when a contact lens wearer develops a red, painful eye.