Conjunctivitis in Cats: A Vet’s 2025 Guide to Pink Eye Causes, Diagnosis & Treatment 😺👁️

Conjunctivitis in Cats: A Vet’s 2025 Guide to Pink Eye Causes, Diagnosis & Treatment 😺👁️

By Dr Duncan Houston, BVSc

🔍 What Is Conjunctivitis?

Conjunctivitis—or "pink eye"—is inflammation of the conjunctiva: the mucous membrane lining the eyelids, third eyelid, and eye surface. This painful condition is common and can affect one or both eyes. :contentReference[oaicite:3]{index=3}

⚠️ What Causes It?

Infectious Causes:

• Viral: Feline herpesvirus‑1 (FHV‑1) is the most frequent, often recurrent agent. Calicivirus also contributes. :contentReference[oaicite:4]{index=4}
• Bacterial: Secondary to viral; or primary from pathogens like Chlamydophila felis, Mycoplasma, Staph, Strep, Bartonella, Pseudomonas. :contentReference[oaicite:5]{index=5}

Non‑infectious Causes:

• Allergic or irritant from pollen, smoke, perfumes. :contentReference[oaicite:6]{index=6}
• Trauma or foreign bodies like scratches, entropion, eyelash misalignment. :contentReference[oaicite:7]{index=7}
• Other pathology such as dry eye, eyelid tumors, uveitis, glaucoma. :contentReference[oaicite:8]{index=8}

🚩 Signs to Watch For

• Red, swollen conjunctiva with squinting and blinking. :contentReference[oaicite:9]{index=9}
• Discharge—watery, pus‑like, yellow/green or bloody. :contentReference[oaicite:10]{index=10}
• Visible third eyelid protrusion. :contentReference[oaicite:11]{index=11}
• Pawing at eye, tear staining, crusted eyelids, sensitivity to light. :contentReference[oaicite:12]{index=12}
• Associated respiratory signs—sneezing, nasal discharge, appetite loss in viral cases. :contentReference[oaicite:13]{index=13}

🔬 Diagnostic Steps

• Physical exam and ocular evaluation. :contentReference[oaicite:14]{index=14}
• Fluorescein stain to check corneal ulceration. :contentReference[oaicite:15]{index=15}
• Schirmer tear test for dry eye. :contentReference[oaicite:16]{index=16}
• Cytology or culture/PCR from eye swabs to identify pathogens like Chlamydia. :contentReference[oaicite:17]{index=17}
• Further systemic tests (e.g., FeLV/FIV) if indicated. :contentReference[oaicite:18]{index=18}

🛠️ Treatment Strategies

Topical Therapies:

• Antibiotic drops/ointments (2–4× daily for 2–3 weeks). :contentReference[oaicite:19]{index=19}
• Antiviral drops (e.g., idoxuridine) or oral antivirals for FHV‑1; supplements like L‑lysine. :contentReference[oaicite:20]{index=20}
• Anti‑inflammatory drops/steroids for allergies (under vet supervision). :contentReference[oaicite:21]{index=21}

Systemic Therapy:

• Oral antibiotics for systemic or deep bacterial infections (e.g., doxycycline for Chlamydia). :contentReference[oaicite:22]{index=22}
• Antihistamines or short-course steroids for allergic conjunctivitis. :contentReference[oaicite:23]{index=23}

Supportive Care:

• Warm compresses to soothe and remove crust.
• Keep eyes clean using saline wipes before medicating.
• Isolate infected cats and maintain hygiene to prevent spread. :contentReference[oaicite:24]{index=24}

🏡 Home Care & Prevention

• Follow full treatment courses—even if symptoms improve early.
• Reduce irritants: smoke‑free, dust‑free environment.
• Vaccinate against FHV‑1 and calicivirus for prevention. :contentReference[oaicite:25]{index=25}
• Use the **Ask A Vet** app for reminders, guidance, and virtual care.
• Provide comfort with soft bedding and calm zones using **Woopf** & **Purrz**.

📅 Prognosis & Follow-Up

• Most cases resolve in days to weeks. :contentReference[oaicite:26]{index=26}
• Chronic FHV-1 may relapse under stress; lifetime management may be necessary. :contentReference[oaicite:27]{index=27}
• Severe cases (ulcers) require referral to veterinary ophthalmologist.
• Recheck exams may include tear tests, cytology, and fluorescein stain.

📝 Quick Reference Table

🐾 Conjunctivitis is common but treatable with early vet intervention and consistent care. Use the **Ask A Vet** app to stay on top of medications and comfort, and provide cozy, stress‑free recovery environments with **Woopf** & **Purrz** products. Your cat's eyes will thank you! ❤️

📢 Always consult your veterinarian before starting any eye treatments or medications.

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