Final answer:
Among the listed field changes, decreased optic disc cupping is NOT seen in open angle glaucoma. Instead, increased optic disc cupping, visual field loss, and optic nerve head damage are the key characteristics, along with increased intraocular pressure.
Step-by-step explanation:
The clinical presentation associated with open angle glaucoma includes a range of characteristic signs except for decreased optic disc cupping. The typical findings in a patient with this condition include visual field loss, especially in the form of peripheral vision deficits. In open angle glaucoma, there is often an increase in intraocular pressure due to the impaired drainage of the aqueous humor from the eye, which can lead to optic nerve head damage over time as the pressure compresses the optic nerve fibers. This pathology differs from the phenomenon of bilateral hemianopia, which is caused by compression of the optic chiasm from a lesion, such as a pituitary growth, and not by increased intraocular pressure.
Regarding the specific items in the question, Decreased optic disc cupping is not a characteristic finding in open angle glaucoma—in fact, increased cupping due to the loss of nerve fibers is one of the hallmarks of the disease. Visual field loss and optic nerve head damage are indeed changes seen in open angle glaucoma patients. Elevated intraocular pressure is another hallmark of the disease and plays a role in the pathogenesis of glaucoma-related optic nerve damage.