Lawrence Veterinary Hospital

3210 Clinton Parkway Ct.
Lawrence, KS 66047



Lawrence Veterinary Hospital, Tono-PenLawrence Veterinary Hospital uses the latest in technology to detect glaucoma. The Tono-Pen XL is a pen-sized hand held computerized tonometer that is gently touched to the cornea to measure intra-ocular eye pressure after the eye is numbed.

Our doctors will make a recommendation for your pet to have a screening if they believe glaucoma is a concern after an exam. If your pet has irritated eyes, enlarged pupils, has experienced head or eye trauma, or you have a specific breed prone to glaucoma, our doctors can help.

It is appropriate to screen both cats and dogs for glaucoma. Signs of glaucoma can include a red or bloodshot eye and/or cloudy cornea (the "clear windshield" part of the eye). Often the eye looks normal to the pet owner–but it is not. Vision loss is also characteristic of glaucoma. However, loss of vision in one eye is usually not obvious because animals compensate very well by using their remaining visual eye. Eventually, the increased intraocular pressure will cause the eye to stretch and enlarge. Unfortunately, by the time the owner notices the enlarged eye, it is too late–eyes are permanently blind by the time they are obviously enlarged. Untreated glaucoma is painful to your pets.

What is Glaucoma?

Glaucoma is increased pressure within the eye (intraocular pressure). Cells inside the eye produce a clear fluid that maintains the shape of the eye and nourishes the tissues inside the eye. The aqueous humor drains out of the eye into the bloodstream through the drainage angle–a sieve or meshwork-like area through which aqueous percolates out of the eye. The balance of aqueous fluid production ("the faucet") and drainage ("the drain in the sink") is responsible for maintaining normal pressure inside the eye. In glaucoma, the drain becomes partially or completely clogged but the "faucet" steadily keeps producing aqueous, causing pressure to build inside the eye. If untreated, this increased pressure usually causes irreversible blindness, in addition to stretching and enlargement of the eye.