Glaucoma In Cats

Glaucoma is high pressure that exists inside of the cat’s eye. When the eye is functioning properly it is always producing and draining a watery type fluid that is known a aqueous humor. When the cat is having trouble draining the fluid it will back up and pressure in the eye will increase. Too much pressure will damage the optic nerve and cause the cat to lose vision in that eye.

Primary Glaucoma

This is a problem in the region where the fluid will exit from the eye. This problem is identified as structural and involves the function of the eye’s ability to drain. This type of glaucoma is usually inherited and is also a very rare form.

Secondary Glaucoma

This type of glaucoma will develop as a side effect of another type of disorder that is inside of the eye. There are several different eye diseases which will put a stop to the flow of the fluid in the eye and cause the pressure to build.


In order to know how to treat or look for the signs of glaucoma you must understand what causes this problem. In both types of the glaucoma what happens is well known – but the causes can be different.

Primary Glaucoma

It is not well known what causes primary glaucoma in cats. All they know is that the condition might be genetic and that it will occur without any warning or signs. In some cases the eye in the cat might not be able to drain properly since birth – but they may not have glaucoma until much later in life.

Secondary Glaucoma

This is the most common form of glaucoma in cats and there are many things which are able to cause it.

Inflammation – when severe inflammation occurs in the eye it will produce debris and protein that will flow inside of the aqueous humor. This debris will clog up the area in which it drains. It can also be blocked at the pupil if the iris is inflamed and it sticks to the lens. Inflammation is the most common cause of glaucoma.

Lens Luxation – it is possible for the lens to become dislocates and will drop into the front chamber of the cat’s eye. When this happens it will block the drainage area. This is a common side effect of chronic inflammation.

Tumors – there are sometimes tumors inside of the eye – which are able to block the drainage area.

Trauma – if the eye is injured in anyway it will sometimes fill up with blood – which will block the drainage area.


  • Red eye
  • Taring
  • Painful eye
  • Squinty eye
  • Cloudy cornea
  • Enlarged eye
  • Blindness
  • Dilated pupil that is not able to react to light