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The Steven's phorometer was dropped, and there were no Jackson cross cylinders. It weighed 2 lb. 8 oz. In 1925, American Optical bought DeZeng, and in 1927 introduced No. 588, the AO Wellsworth DeZeng Phoroptor, which was slightly larger; the lenses were increased to 11/16 inch and it weighed 3 lb. 2 oz. This was the first in the DeZeng/AO line ...
Collecting medical history is the first and an essential step in eye examination. [2] [3] Many eye conditions are associated with systemic health, and many diseases can have manifestations in the eye. Certain systematic medications can carry ocular side effects and warrant routine eye exams. [3]
The most common victims of theobromine poisoning are dogs, [8] [9] for whom it can be fatal. The toxic dose for cats is even lower than for dogs. [10] However, cats are less prone to eating chocolate since they are unable to taste sweetness. [11] Theobromine is less toxic to rats and mice, who all have an LD 50 of about 1,000 mg/kg (0.016 oz/lb).
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[8] [10] Dilated fundus exam is the preferred method of diagnosis, as undilated exam may be too limited to visualize lesions or neovascularization that are more peripheral. [11] Glaucoma: A group of eye diseases that can cause vision loss due to damage to the optic nerve, generally from increased intraocular pressure. Changes on ophthalmologic ...
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Glaucoma in a dog Canine glaucoma refers to a group of diseases in dogs that affect the optic nerve and involve a loss of retinal ganglion cells in a characteristic pattern. An intraocular pressure greater than 22 mmHg (2.9 kPa) is a significant risk factor for the development of glaucoma.