Blind Quiet Eye in Dogs

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Blind quiet eye is the loss of vision in one or both eyes without ocular vascular injection or other apparent signs of eye inflammation. This may occur due to abnormalities in retinal image detection, retinal focusing, optic nerve transmission, or simply the central nervous system's inability to interpret images correctly.

Symptoms and Types

Because Blind Quiet Eye directly affects the dog's vision, it may display several signs, including:

  • Clumsy behavior (e.g., bumping into objects, tripping, falling)
  • Decreased or absent menace response (i.e., does not blink when a hand is waved toward the eyes)
  • Impaired visual placing responses (e.g., extends the paws incorrectly when trying to approach a nearby surface)

In addition, these problems may become more exaggerated when the dog is outside at night.

Causes

There are several causes for Blind Quiet Eye, such as cataracts, central nervous system lesions, and the lens' inability to focus correctly. Other common causes include:

  • Optic nerve issues due to:

Diagnosis

You will need to give a thorough history of your dog’s health and the onset and nature of the symptoms to the veterinarian. He or she will then perform a complete physical examination (including an opthalmoscopic exam) as well as a biochemistry profile, urinalysis, complete blood count (CBC) to rule out potential systemic causes of the disease.

During the ophthalmic exam a penlight will be used to rule out potential systemic causes of the disease, such as cataracts or retinal detachment. (In cases of retinal detachment, the systemic blood pressure is often elevated.) Ophthalmoscopy, meanwhile, may reveal progressive retinal atrophy or optic nerve disease.

If the ophthalmic exam reveals nothing irregular, it may suggest sudden acquired retinal degeneration syndrome (SARDS), retrobulbar optic neuritis (inflammation of the optic nerve after it exits the eye toward the brain), or a central nervous system (CNS) lesion. If the diagnosis is still in doubt, electroretinography — whic measures the electrical responses of photoreceptor cells in the retina — makes it possible to differentiate retinal from optic nerve or CNS disease. Ocular ultrasounds and CT (computed tomography) and MRI (magnetic resonance imaging) scans are also very helpful to visualize and diagnose orbital or CNS lesions.

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ophthalmologist

A professional skilled in the study of the eye

retina

The layer of the eye that is charged with receiving and processing images

urinalysis

An in-depth examination of the properties of urine; used to determine the presence or absence of illness

ophthalmic

Anything having to do with the eye or care of the eye

systemic

Something that is related to the whole body and not just one particular part or organ

neuritis

A medical condition that results when the nerves become inflamed

blood pressure

The amount of pressure applied by the blood on the arteries.

lesion

A change in the way that tissue is constructed; a sore

nerve

A bundle of fibers that are used in the process of sending impulses through the body

atrophy

The wasting away of certain tissues; a medical condition that occurs when tissues fail to grow.

ocular

Anything having to do with the eye

Courtesy of petmd.com Original Article

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