References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
Yes, some STIs can affect the eyes. Infections that are transmitted sexually can also spread to the eye through direct contact with infected fluids, through the bloodstream, or at birth from mother to baby. Eye involvement with STIs is uncommon but important to recognise because early treatment can prevent serious complications including vision loss.
Here’s what can happen and what to look for.
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STIs That Can Affect the Eyes
| STI | Eye Condition | Symptoms |
|---|---|---|
| Chlamydia | Conjunctivitis, trachoma | Red, sticky eye, discharge |
| Gonorrhoea | Severe conjunctivitis | Copious discharge, rapid onset, can damage cornea |
| Syphilis | Uveitis, retinitis, optic neuritis | Blurred vision, pain, sensitivity to light |
| Herpes simplex | Keratitis | Eye pain, redness, blurred vision, ulcers |
| HIV | CMV retinitis (with very low CD4) | Floaters, visual field loss, usually painless |
How Eyes Get Infected
- Direct contact — touching genitals then eyes, or oral-genital contact followed by eye contact
- Bloodstream spread — syphilis and HIV-related CMV reach the eye via blood
- Birth canal transmission — newborns can get chlamydial or gonococcal conjunctivitis during delivery
- Reactivation — herpes can reactivate in the eye
Specific Conditions to Know
Gonococcal conjunctivitis
A medical emergency. Causes rapid onset of severe eye discharge and can damage the cornea within days if untreated. Any sexually active person with dramatic eye discharge should be evaluated urgently.
Ocular syphilis
Can mimic many other eye conditions. Syphilis testing is now recommended for many unexplained eye problems, particularly uveitis. Treated with penicillin.
Herpes keratitis
Recurrent herpes infection of the cornea. Can lead to scarring and vision loss if not treated. Usually treated with topical and oral antivirals.
CMV retinitis
Occurs almost exclusively in people with HIV and CD4 counts below 50. New floaters or vision loss in someone with advanced HIV is a medical emergency. Starting or optimising ART is the most important intervention.
When to Seek Help
- Any new visual changes — especially floaters, flashing lights or vision loss
- Red, painful eye that’s not getting better
- Discharge from the eye, especially if sudden and heavy
- Sensitivity to light with eye pain
- Eye problems if you have HIV with a low CD4 count
Prevention
- Wash hands after sexual contact before touching your eyes
- Don’t share eye makeup
- Treat STIs promptly to prevent complications
- If you have HIV, stay on ART — it prevents most eye complications
Read more: Eye problems and HIV | What is chlamydia? | What is syphilis?
Frequently Asked Questions
Can I really get chlamydia in my eye?
Yes. Chlamydial conjunctivitis occurs when infected genital fluid reaches the eye, usually via the hands. It’s treatable with antibiotics.
How is a sexually transmitted eye infection treated?
Treatment targets the specific infection — antibiotics for bacterial causes, antivirals for herpes. Oral or injected treatment is often needed, not just eye drops.
Should sex partners be treated if I have an STI eye infection?
Yes. Partners should be assessed, tested and treated to prevent reinfection and protect their own health.
Related reading
- A to Z of Sex: Sexual Health Terms Explained
- Alcohol and HIV: What You Need to Know
- Anxiety and HIV: Coping and Getting Support
- Are All STIs Curable?
- Blood Problems and HIV: Anaemia, Low Platelets and More
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
