Ocurenew space in our visual field so if we lose some of that we don't even know i mean we have a blind spot anyway that corresponds where optic nerve is but it's covered by the other eyes and we don't know so glaucoma what it is is the deterioration of the optic nerve because the optic nerve can't tolerate the pressure that's that it's subject to the intraocular pressure is essentially defined as the fluid pressure of the eye itself over and above atmospheric pressure so in other words if you close ,.
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