TL;DR: Blood in a cat's eye, known as hyphema, is a high-priority medical emergency that requires immediate veterinary attention to prevent permanent blindness and diagnose potentially life-threatening underlying conditions.
What does it mean if there is blood pooling in my cat's eye?
Noticing blood inside your cat's eye can be a frightening experience. This condition is medically known as hyphema, which refers to the presence of blood in the anterior chamber (the space between the cornea and the iris). It may appear as a small red streak, a pool at the bottom of the eye, or in severe cases, the entire clear part of the eye may look deep red or black. This is not a disease itself, but rather a symptom of a significant underlying issue such as trauma, high blood pressure, or clotting disorders.
Is blood pooling in my cat's eye a medical emergency?
- High Urgency: Hyphema is a serious ocular emergency that requires immediate veterinary evaluation.
- Risk of Glaucoma: If left untreated, the internal pressure of the eye can rise, leading to permanent blindness and extreme pain.
- Systemic Warning: Because hyphema is often caused by feline hypertension or organ failure, it may signal a life-threatening condition elsewhere in the body.
How does taking a photo of my cat's eye help with triage?
- Capture the baseline: If your cat is calm, take a clear photo in good lighting before heading to the clinic.
- Monitor changes: A photo is vital because blood can shift, settle, or increase in volume during transport.
- Diagnostic aid: Showing the veterinarian the eye's initial appearance helps them determine the severity and progression of the bleeding.
Clinical Context (Merck Veterinary Manual)
Hyphema, or hemorrhage in the anterior chamber of the eye, can manifest as small, focal blood clots, diffuse unclotted hemorrhage occluding deeper examination, or multiple layers of recurrent hemorrhage. Causes include uveitis, trauma, intraocular neoplasia, retinal detachments and tears, systemic hypertension, coagulation factor abnormalities, platelet disorders, hyperviscosity, and congenital ocular anomalies. In cats, systemic diseases such as feline infectious peritonitis, toxoplasmosis, feline immunodeficiency virus, and feline leukemia virus can present as anterior uveitis, retinal detachment, intraocular hemorrhage, and secondary glaucoma, potentially leading to acute vision loss.
Chapter: Ophthalmology
Source: The Merck Veterinary Manual, 11th Edition (Page 497)