Blindness

What It Is

Vision loss ranges from a small blind spot to complete blindness in one or both eyes, and it can come on within hours or build slowly enough that an owner misses the early signs. Animals losing vision gradually often adapt so well in a familiar home that the problem only becomes obvious when furniture is moved or they visit somewhere new. Signs at home include bumping into objects, hesitating at stairs, reluctance to jump, or a change in eye appearance such as cloudiness. Dogs, cats, horses, and rabbits can all lose vision from a wide range of causes, and some breeds carry a genetic predisposition toward inherited eye disease.

Common Causes

Cataracts, a clouding of the lens inside the eye, are a leading cause of gradual blindness in older dogs and are also common in diabetic dogs. Progressive retinal atrophy is an inherited condition that slowly destroys the retina in certain dog breeds, usually starting with poor night vision. Sudden blindness can come from a detached retina, often linked to high blood pressure in older cats, or from inflammation deep inside the eye. Glaucoma, a painful rise in pressure inside the eye, can cause rapid vision loss if not treated quickly. Head trauma and certain toxins are less common but serious causes of sudden vision loss.

When It Is an Emergency

Sudden blindness in one or both eyes always warrants same-day veterinary care, since some causes, such as a retinal detachment or glaucoma, can still be partly reversible if treated within hours. A red, painful, cloudy eye alongside vision loss needs urgent attention rather than a wait-and-see approach. Sudden blindness in an older cat should prompt a check of blood pressure, since untreated high blood pressure is a common and preventable cause.

What the Vet Will Do

An eye exam with an ophthalmoscope lets the vet look at the lens, retina, and internal eye pressure. Blood pressure measurement and blood tests help rule out underlying disease such as diabetes or hypertension. Referral to a veterinary ophthalmologist may follow for specialized testing or for a cataract removal, which can restore vision in suitable candidates.

Home Care and Prevention

Keep furniture and food and water bowls in consistent locations, since a blind animal builds a mental map of a stable environment remarkably well. Add texture cues, such as a mat near stairs, to help the animal navigate confidently. Block access to pools, balconies, and stairs in an unfamiliar space. Routine eye exams in predisposed breeds, and good control of diabetes or blood pressure in older cats, help catch treatable causes before vision is lost.