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Equine recurrent uveitis (ERU) – also known as moon blindness, recurrent iridocyclitis, or periodic ophthalmia [1] – is an acute, nongranulomatous inflammation of the uveal tract of the eye, occurring commonly in horses of all breeds, worldwide. The causative factor is not known, but several pathogeneses have been suggested.
These conditions can be detected via ultrasound examination of the eye. In a 2013 study of Comtois horses and Rocky Mountain Horses, all animals carrying the mutated form of PMEL17 had some eye disorder, though milder problems in animals heterozygous for the allele versus those who were homozygous.
The eye of a horse. The equine eye is one of the largest of any land mammal. [1] Its visual abilities are directly related to the animal's behavior; for example, it is active during both day and night, and it is a prey animal. Both the strengths and weaknesses of the horse's visual abilities should be taken into consideration when training the ...
Preliminary laboratory investigations using retinoscopy of 240 dogs [4] found myopic problems with varying degrees of refraction errors depending on the breed. In cases involving German Shepherds, Rottweilers and Miniature horses, the refraction errors were indicative of myopia. Nuclear sclerosis of the crystalline lens was noticed in older ...
Vision problems are not associated with gray, dilute, or white coat colors in horses, and blue eyes in horses do not indicate poor vision. Eyes are pigmented at the front of the iris called the stroma, and in a thin layer at the back of the iris in tissue called the iris pigment epithelium. The iris pigment epithelium prevents damaging light ...
Asteroid hyalosis is a degenerative condition of the eye involving small white opacities in the vitreous humor. [1] It is known to occur in humans, dogs, cats, horses, and chinchillas. [2] Clinically, these opacities are quite refractile, giving the appearance of stars shining in the night sky—except that ocular asteroids are often quite mobile.
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In horses that are difficult to treat, or in cases that require very frequent treatment, then placement of a sub-palpebral lavage system can be very useful. As an adjunct to therapy, physical protection of the eye may be required, in the form of a mask. Some horses will rub their eyes in response to pain, and this can cause further corneal damage.