Non‑Ulcerative Keratitis in Cats: 2025 Vet Insights 🐱👁️

Hello! I’m Dr Duncan Houston BVSc, feline veterinarian and founder of Ask A Vet. In 2025, non‑ulcerative keratitis remains a relatively common cause of feline ocular disease—characterized by corneal inflammation without any ulceration. Causes include immune-mediated keratitis (IMMK), chronic herpesvirus infection, lipid keratopathy, and keratoconjunctivitis sicca. Left untreated, it can impair vision and cause chronic discomfort. This guide reviews causes, signs, advanced diagnostics, management strategies (topical therapy, tear support), and how telehealth tools like Ask A Vet, Woopf & Purrz empower ongoing care. 💙

📌 What Is Non‑Ulcerative Keratitis?

Non‑ulcerative keratitis refers to inflammation of the cornea **without disruption** of the corneal epithelium—meaning no ulceration. Instead, the cornea shows vascularization, pigmentation, lipid deposition, edema, or immune cell infiltration. Common types include:

• Immune-mediated keratitis (such as feline chronic superficial keratitis).
• Herpesvirus-associated chronic keratitis.
• Lipid keratopathy from hypercholesterolemia or corneal dystrophy.
• Keratoconjunctivitis sicca (dry eye) leading to secondary keratitis.

⚠️ Why It Matters

• Causes ocular discomfort, squinting, tearing, redness, and potential vision loss.
• Corneal vascularization leads to scarring and reduced transparency.
• Recurrent inflammation risks permanent corneal damage and vision impairment.

👥 Which Cats Are Affected?

• All ages—IMMK often seen in mid‑aged to older cats, herpes keratitis in younger immunocompromised cats.
• Cats with dry eye, hyperlipidemia, or chronic viral infection.
• No strong breed predilection; outdoor cats may acquire herpes infections more often.

🔍 Clinical Signs

• **Mild to moderate ocular pain**: squinting, frequent blinking, blepharospasm.
• **Corneal vascularization**: superficial or deep vessels visible on cornea.
• **Corneal cloudiness**: due to edema, scarring, or lipid deposition.
• **Redness** (conjunctival hyperemia), ocular discharge.
• **Vision impairment**: bumping into objects, reluctance to navigate.
• **Dryness** in cases of KCS; thick mucoid discharge.

🔬 Diagnostic Workflow

1. History & examination: Onset, indoor/outdoor, medications, previous FHV‑1 infection.
2. Fluorescein staining: Confirms absence of ulceration.
3. Tear test (Schirmer): Diagnose KCS.
4. Tonometry: Measure IOP to rule out uveitis or glaucoma.
5. Corneal cytology/culture: Rule out infectious causes.
6. Advanced imaging: OCT (optical coherence tomography) or high‑resolution ultrasound—assess corneal thickness and depth of lesions.
7. Bloodwork: CBC/chemistry to detect hyperlipidemia, endocrine disease.
8. PCR testing: Detect feline herpesvirus DNA in corneal swabs.

🛠️ Treatment Strategies (2025)

A. Anti‑Inflammatory Therapy

• Topical corticosteroids (e.g., prednisolone acetate 1 % or dexamethasone)—mainstay for IMMK and herpes keratitis control).
• Topical cyclosporine or tacrolimus—used long‑term in immune cases to maintain remission.
• Short courses of NSAID drops\ like diclofenac if steroids are contraindicated.

B. Antiviral Treatment

• Topical famciclovir or cidofovir drops for chronic FHV‑1 keratitis.
• Keep environment humid to reduce viral shedding.

C. Tear Support & Lipid Management

• Artificial tears/ocular gels cotton onu session, 3‑6× daily.
• Lipid-lowering therapy such as omega‑3 supplements and diet adjustment when hyperlipidemia confirmed.

D. Surgical or Laser Intervention

• Superficial keratectomy for severely vascularized plaques.
• Laser ablation of neovascular tissue (e.g., diode laser) to reduce scarring and discomfort.

🌱 Prognosis & Monitoring

• IMMK and herpes keratitis can be controlled with lifelong topical therapy and regular follow-ups.
• Lipid keratopathy often stabilizes with systemic diet and topical tear support.
• Chronic monitoring every 3–6 months with tear tests, ocular imaging, and pressure checks is essential.

🏠 Home Care & Telehealth Tools

• Ask A Vet: Provides dosing reminders for eye drops, environmental humidity tips, and signs of flare‑ups.
• Woopf: Delivers topical medications, tear gels, laser nostrituried for home use, plus humidifiers.
• Purrz: Helps track blinking, discharge, vision changes, and flags worsening by alerting caregivers.

🛡️ Prevention & Lifestyle Tips

• Maintain indoor humidity to support healthy tear film.
• Prevent stress in FHV‑1 cats; avoid overcrowding and lens exposure.
• Regular veterinary eye exams for cats with chronic ocular inflammation.
• Avoid ocular irritants such as smoke, dust, and hair sprays.

🔬 2025 Innovations & Research

• **OCT-based corneal density mapping** to detect early inflammatory or lipid changes.
• **Long-lasting ocular implants** releasing cyclosporine or steroid slowly over weeks.
• **Topical antiviral nanoparticles** under clinical study to reduce dosing frequency.
• **Wearable ocular sensors** via Purrz band to track blink rate, temperature, and irritation.

✅ Vet‑Approved Care Roadmap

1. Recognize signs—squinting, tearing, cloudiness—book ocular exam.
2. Confirm non‑ulcerative keratitis (fluorescein negative); run tear test, IOP, cytology, viral PCR.
3. Start topical anti‑inflammatory therapy (steroid ± cyclosporine), consider antiviral if FHV suspected.
4. Add artificial tears and lipid-control measures if needed.
5. Consider keratectomy or laser in refractory vascular plaques.
6. Monitor with Ask A Vet, Woopf, Purrz; recheck every 3–6 months.
7. Adjust treatment based on flare‑ups and imaging changes.

✨ Final Thoughts from Dr Houston

Non‑ulcerative keratitis in cats may linger as a chronic eye issue, but with precise diagnosis, targeted topical therapy, and home support via Ask A Vet, Woopf & Purrz, most cats maintain comfort and vision. Early detection, environmental control, and ongoing care are vital. Your dedication keeps their world clear and bright. 💙🐾

Need tailored eye-care support? Visit AskAVet.com or download our app for drop reminders, flare‑up guidance, humidity control tips, and advanced monitoring for your cat’s corneal health.