Rest assured, veterinary medicine doesn't check eye pressures with the dreaded 'air puff' test that is common in human ophthalmology. If your dog has uveitis in one or both eyes, they will have lower than normal pressures. This condition causes one of the dog's pupils to be smaller than the other. Anisocoria refers to an unequal pupil size. The syndrome is characterized by anisocoria (pupil smaller on the affected side), mild ptosis. The pupil expands when there is little light present, and contracts when there is a greater amount of light present. Lesions anywhere along this pathway may cause Horner syndrome. If your dog has glaucoma in one or both eyes, they will have higher than normal pressures. The pupil is the circular opening in the center of the eye that allows light to pass through. Checking your dog's intraocular pressures can check for glaucoma as well as uveitis. The stain will collect in the ulcer itself so that, even when excess stain is flushed out of the eye, the stain will still fluoresce under a black light. All this to say, you may think your dog just has funky tears when in reality he has a lack of them! Staining the eye with fluorescein dye can illuminate any ulcers on your dog's cornea. Anisocoria may be present for a number of reasons. 'Anisocoria' is the medical term for unequal pupil sizes. Either the parents or the primary care doctor may notice this difference early in life. We often see new young patients to evaluate one pupil being larger than the other. Your dog's eyes will actually try to compensate but instead of tears they may produce a thick, sticky discharge. Anisocoria (Different Size Pupils in Children) Unequal Size Pupils. There are certain disease processes that will inhibit tear production. A Schirmer tear test will check the ability of your dog's eyes to create tears. Most eye workups will start with three basic tests: A Schirmer tear test, fluorescein stain, and an intraocular pressure test. Diagnosing the Reason for Your Dog's Anisocoria
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