What is horner's syndrome?

Horner鈥檚 syndrome consists of five signs:

Constricted Pupil

Elevation of the Third Eyelid

Retraction of the eyeball into the head

Slight drooping of the Eyelid

Increased pink color and warmth of the ear and nose on the affected side (very hard to detect in small animals)
All these signs are caused by damage to sympathetic nervous system as it supplies the eye on the affected side of the head.

WHAT IS THE SYMPATHETIC NERVOUS SYSTEM?

Our bodies have numerous functions that are controlled by our nervous systems yet we are completely unaware of them. Our heart and respiratory rates, the amount of sweat and other secretions we produce, circulation to different body areas, pupil dilation and constriction are all regulated by our nervous systems automatically and without our knowledge or control. The part of our nervous system dedicated to these automatic systems is called the 鈥淎utonomic nervous system.鈥?br>
The autonomic nervous system is divided into the 鈥渟ympathetic nervous system鈥?and the 鈥減arasympathetic nervous system.鈥?The parasympathetic system maintains a status quo, normal, 鈥渂usiness as usual鈥?state; the sympathetic system prepares the body for a 鈥渇ight or flight鈥?situation. Some changes that might be stimulated by the sympathetic system include: increased sweating, dilated pupils, increased heart rate, and increased blood flow to muscles. Both systems coexist in balance in the healthy body.

When the sympathetic system controlling one of the eyes is damaged, only the parasympathetic nerves work and Horner鈥檚 syndrome is created.

Doh!

Its a problem with the pupils, most peoples widen in the dark to aid vision but with Horners this doesn't happen.

it is a disease of nerves that supply the eye,, sinus ,face,and middle ear .the eye receives a drop of cocaine(under docs supervision,,,the pupil doesnt constrict with cocaine present because norepinephrine is lacking along the nerve pathway,,,,,,horners is sometimes incidental to motor neuron disease,like ms,also might be problem with sweating on one side of face,lack of tearing in eye,migraine,droopy eyelid