Dogs' eyes consist of aqueous humor, just like those of human beings. Aqueous humor is a transparent substance that includes oxygen and nutrients that components within the eyes utilize. The "iridocorneal angle" in dogs refers to a designated location for the departure of aqueous humor.
Iridocorneal Angle Identification
Aqueous humor evacuates the eyes regularly. This occurs in the middle of the iris and the cornea. The location is known as the "iridocorneal angle." Other common names for the location are both drainage angle and filtration angle. Dogs' eyes can maintain intraocular pressure when the evacuation and manufacturing of aqueous humor is totally even, according to veterinarian Ernest Ward of the website for VCA Animal Hospitals.
Manufacturing of Aqueous Humor
Aqueous humor is a clear fluid. While it drains out from the iridocorneal angle straight into dogs' bloodstreams, it's first made in a different location. Aqueous humor is manufactured within the ciliary body, say the veterinarians at the Animal Eye Care Clinic. The ciliary body is the tissue in the back of the iris.
Iridocorneal Angle and Glaucoma
The iridocorneal angle in dogs is often associated with glaucoma, a medical condition that involves excessive eye pressure and, as a result, insufficient fluid evacuation. Glaucoma in dogs generally arises because of interferences in fluid drainage, specifically obstruction of the iridocorneal angle or pupil. These interferences lead to higher intraocular pressure. If you're worried that your pet might have glaucoma, be attentive to key symptoms such as aching of the eye, pawing at the eye, widened pupils, blinking, conspicuous eyeball protrusion, watery substances coming out of the eye and vision problems. Canines of some breeds are particularly vulnerable to glaucoma, notably shih tzus, beagles, giant schnauzers, Siberian huskies, cocker spaniels, Italian greyhounds, basset hounds, chow chows, poodles and Samoyeds.
Evaluating the Iridocorneal Angle
Viewing the iridocorneal angle in canines can only occur with the assistance of contact lenses known as goniolenses, says veterinarian Sally M. Turner of "Small Animal Ophthalmology." When veterinarians evaluate dogs for primary glaucoma, they do so by observing the iridocorneal angles. This process is known as the "gonioscopy." Through a gonioscopy, a veterinarian can gain valuable insight on how a dog's iridocorneal angle looks. A gonioscopy can also help a veterinarian look out for foreign matter, pigment infiltration and neoplastic infiltration, to start.
- VCA Animal Hospitals: Glaucoma in Dogs
- Canine Glaucoma - Pathophysiology and Diagnosis; Shelby L. Reinstein et al.
- Animal Eye Care: Iridocorneal Angle or Drainage Angle
- British Veterinary Association: Hereditary Eye Disease in Dogs
- Small Animal Ophthalmology; Sally M. Turner
- Assessing Ocular Toxicology in Laboratory Animals; Andrea B. Weir et al.
- PetMD: Glaucoma in Dogs