A history of feudalism, British and continental by Andrew Bell, Cyrus R. Edmonds

By Andrew Bell, Cyrus R. Edmonds

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These changes are often accompanied by some cell loss. 3 The above described activation of astrocytes supports such an assumption. Is GON an ischemic lesion? 4b).  The occurrence of NTG, however, makes such an explanation unlikely.  The fact that ocular ischemic syndrome (as seen in patients with occlusive carotid artery disease, for example) does not lead to GON makes this hypothesis also unlikely. 4 ONH atrophy (a) after AION; (b) in glaucoma. 1 Reperfusion leads to an increased production of free oxygen radicals, especially in the mitochondria.

It refers to conditions in which the iris occludes the trabecular meshwork, thus impeding outflow.  The implication of new definitions is that the rates of glaucoma reported in population studies must be reassessed.  Further analysis of the effect of sex difference could not be carried out as the sample size was too small.  Br J Ophthalmol 1996; 80:389–393). 5% of subjects with POAG; 87% were previously undiagnosed.  In general, people of African heritage and Asians are more inclined to develop glaucoma and to lose their sight than Caucasians.

6 This hypothesis was formulated on the basis of the observation that a known mitochondriopathy like Morbus Leber or dominant optic atrophy leads to GON­like atrophy. The energy consumption in the optic nerve head is indeed extremely high and therefore the mitochondria are crowded in the axons of this part of the nerve.  It is, however, unlikely that glaucoma is a result of a not yet detected mutation of the mitochondrial DNA.  The mitochondria, including the mitochondrial DNA, may be damaged by free radicals and such damage may cumulate over time, especially if the repair systems are no longer working properly.

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