Quinsy Keratitis – A Comprehensive Patient Guide
Overview
Quinsy keratitis (also called peritonsillar abscess‑associated keratitis) is a rare inflammatory condition of the cornea that occurs secondary to a peritonsillar (quinsy) infection. The infection spreads from the throat to the eye via the nasolacrimal duct or bloodstream, causing a painful, ulcerative keratitis.
Although primary bacterial keratitis is common, quinsy‑related keratitis accounts for less than 1 % of all keratitis cases worldwide.[1] CDC, 2023 It typically affects adults between 30‑60 years of age, with a slight male predominance (≈57 %).
Because the condition combines two distinct anatomic regions (oropharynx and eye), early recognition is essential to prevent permanent vision loss.
Symptoms
Symptoms develop rapidly—often within 24‑48 hours of the onset of a peritonsillar abscess. Common presentations include:
- Severe eye pain – a deep, throbbing sensation that worsens with eye movement.
- Photophobia – intense sensitivity to light.
- Redness (conjunctival injection) – diffuse or localized to the affected eye.
- Decreased visual acuity – blurred or hazy vision; may be sudden.
- Tearing or discharge – watery or purulent, often unilateral.
- Foreign‑body sensation – feeling of something gritty on the cornea.
- Swelling of the eyelids – sometimes with palpable warmth.
- Corneal ulcer or infiltrate – visible on slit‑lamp exam as a white or yellowish lesion.
- Fever, chills, and sore throat – symptoms of the underlying quinsy.
Causes and Risk Factors
Primary cause
Quinsy keratitis is usually the result of:
- Peritonsillar abscess (quinsy) – a collection of pus behind the tonsil caused by Group A Streptococcus, Staphylococcus aureus, anaerobes, or mixed flora.
- Spread of infection – either:
- Direct extension via the nasolacrimal duct, or
- Hematogenous seeding (bacteria entering the bloodstream and lodging in the cornea).
Risk factors
- Recent or untreated sore throat/tonsillitis.
- Immunosuppression (diabetes, HIV, chemotherapy, chronic steroid use).
- Contact lens wear—provides a portal for bacteria.
- Dry eye disease or ocular surface disease that compromises the corneal epithelium.
- Alcohol or tobacco use—impairs mucosal immunity.
- History of recurrent peritonsillar infections.
Diagnosis
Because symptoms overlap with other forms of bacterial keratitis, a thorough evaluation is required.
Clinical examination
- Visual acuity test – baseline measurement.
- Slit‑lamp biomicroscopy – reveals ulcer size, depth, and presence of hypopyon (pus in the anterior chamber).
- Fluorescein staining – highlights epithelial defects.
- Evaluation of the oropharynx – inspection for peritonsillar swelling, uvular deviation, or pus.
Laboratory tests
- Corneal scrapings – collected with a sterile blade for Gram stain, culture, and sensitivity. This guides antibiotic choice.
- Throat swab / aspirate – cultures from the quinsy to identify the same organism.
- Blood cultures – indicated if systemic signs (fever, chills) are present.
Imaging (when indicated)
- Orbital CT or MRI – if there is concern for orbital cellulitis or extension of infection.
- Ultrasound of the neck – can confirm the size of a peritonsillar abscess.
Treatment Options
Management must address both the ocular infection and the underlying quinsy. A multidisciplinary approach (ophthalmology + ENT) is recommended.
Medical therapy
- Topical antibiotics – fortified broad‑spectrum drops (e.g., 5 % fortified cefazolin and 1 % fortified vancomycin) administered hourly initially.[2] Cleveland Clinic, 2022
- Systemic antibiotics – intravenous (IV) coverage for streptococci, staphylococci, and anaerobes (e.g., ceftriaxone 1‑2 g q24 h + metronidazole 500 mg q8 h).
- Analgesia – oral NSAIDs (ibuprofen 400‑600 mg q6‑8 h) or acetaminophen; consider short‑course opioids for severe pain under supervision.
- Adjunctive therapy – cycloplegic drops (atropine 1 % BID) to reduce ciliary spasm and pain.
- Antifungal/antiviral agents – only if cultures indicate non‑bacterial pathogens.
Surgical interventions
- Incision & drainage (I&D) of the peritonsillar abscess – performed by ENT within 24 h of diagnosis; eliminates the source of bacterial spread.
- Therapeutic corneal debridement – removal of necrotic tissue under topical anesthesia to enhance antibiotic penetration.
- Amniotic membrane transplantation (AMT) – for large, non‑healing ulcers to promote epithelialization.
- Penetrating keratoplasty – rarely required, reserved for perforation or scarring threatening vision.
Lifestyle and supportive measures
- Warm saline eye rinses 4‑6 times daily.
- Strict hand hygiene; avoid touching the eye.
- Discontinue contact lens wear until cleared by an ophthalmologist.
- Stay hydrated and maintain adequate nutrition to support immune function.
Living with Quinsy Keratitis
Even after acute treatment, many patients need ongoing care to restore visual function and prevent recurrence.
- Follow‑up appointments – at least twice weekly for the first month, then monthly until the cornea fully heals.
- Eye‑protective glasses – wear sunglasses outdoors to reduce UV‑induced photophobia.
- Lubricating eye drops – preservative‑free artificial tears 4‑6 times daily to keep the ocular surface moist.
- Vision rehabilitation – if scarring results in reduced acuity, low‑vision aids (magnifiers, high‑contrast glasses) may help.
- Psychological support – acute eye pain and vision loss can be stressful; consider counseling if anxiety or depression develops.
Prevention
Because quinsy keratitis stems from a throat infection, primary prevention focuses on reducing the risk of peritonsillar abscess and protecting the ocular surface.
Oral health measures
- Prompt treatment of streptococcal pharyngitis with a full course of antibiotics (e.g., penicillin V).
- Seek ENT evaluation for recurrent sore throats or signs of quinsy (severe unilateral throat pain, muffled voice, trismus).
- Good oral hygiene – brush twice daily, floss, and regular dental check‑ups.
Eye‑specific measures
- Hand‑washing before handling contact lenses; replace lenses and storage cases as recommended.
- Avoid sleeping in contact lenses unless specifically approved for extended wear.
- Use preservative‑free artificial tears if you have dry eye syndrome.
- Protect eyes from trauma, chemicals, and excessive wind.
Complications
If not adequately treated, quinsy keratitis can lead to serious ocular and systemic sequelae:
- Corneal perforation – a hole in the cornea that may require urgent surgical repair.
- Anterior chamber infection (endophthalmitis) – sight‑threatening intra‑ocular infection.
- Corneal scarring – permanent visual impairment, possibly necessitating keratoplasty.
- Secondary glaucoma – caused by inflammation or steroid use.
- Systemic spread – bacteremia, sepsis, or pulmonary involvement from the primary quinsy.
When to Seek Emergency Care
Call 911 or go to the nearest emergency department immediately if you experience any of the following:
- Sudden loss of vision or vision that worsens rapidly.
- Severe eye pain unrelieved by medication.
- Noticeable white or black spot (corneal ulcer) that is expanding.
- Swelling of the eyelids or eye that involves the whole orbit (possible orbital cellulitis).
- Fever > 101 °F (38.3 °C) combined with eye symptoms.
- Yellow‑green discharge or pus that is thick and increasing.
- Signs of systemic infection: chills, rapid heartbeat, confusion.
References
- Centers for Disease Control and Prevention. “Bacterial Keratitis Surveillance.” 2023.
- Cleveland Clinic. “Management of Bacterial Keratitis.” Updated 2022.
- Mayo Clinic. “Peritonsillar Abscess (Quinsy).” 2024.
- World Health Organization. “Guidelines for the Prevention of Blindness.” 2021.
- National Eye Institute (NEI). “Corneal Ulcer Facts.” 2023.