Glaucoma is increased pressure within the eye (intraocular pressure = IOP). Cells inside the eye produce a clear fluid (“aqueous humor”) that maintains the shape of the eye and nourishes the tissues inside the eye. (Note: aqueous humor is NOT the same fluid as tears. Tears bathe the outside surface of the eye. Aqueous humor circulates inside the eye. These two fluids do not interact). 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 ” 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.

Rescued baby squirrel with glaucoma has eye removed

DETROIT — The options were limited when Thelma and Louise — 4-week-old squirrels found in a yard — were brought to a veterinary hospital in Birmingham.
“It was euthanize them or try to raise them,” said Dr. Laura Witherell.
The veterinarian at Gasow Veterinary Hospital hadn’t raised squirrels before, but agreed to give it a shot.
“I just wanted to give them a chance,” Witherell said.
She had the animals for about a week when they first opened their eyes. It didn’t take long before Witherell, who works at a clinic specializing in cats and dogs, realized there was a problem with Thelma’s right eye and sought additional help for the squirrel.
“She had glaucoma,” said Dr. Michael West, a veterinary ophthalmology resident atBluePearl Veterinary Partners, adding that Thelma couldn’t see out of the eye. “It’s a painful condition.”
He has performed surgery on dogs and cats, even zoo penguins, but never on a squirrel — until last week.
On Tuesday, Thelma, who weighed less than a pound, had her right eye removed during surgery in Southfield……
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Source: USA Today