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The optic nerve contains axons of nerve cells that emerge from the retina, leave the eye at the optic disc, and go to the visual cortex where input from the eye is processed into vision. There are 1.2 million optic nerve fibers that derive from the retinal ganglion cells of the inner retina. [2] Damage to the optic nerve can have different causes:
In a sixth nerve palsy one would expect that, over the 6 month observation period, most patients would show the following pattern of changes to their ocular muscle actions: firstly, an overaction of the medial rectus of the affected eye, then an overaction of the medial rectus of the contraletral eye and, finally, an underaction of the lateral ...
The experience of eye strain when reading in dim light has given rise to the common misconception that such an activity causes permanent eye damage. [3] When concentrating on a visually intense task, such as continuously focusing on a book or computer monitor, the ciliary muscles and the extraocular muscles are strained. This causes discomfort ...
As many as 20% of veterans who served in Iraq and Afghanistan have post-traumatic stress disorder, or PTSD, a diagnosis that includes the flashbacks, nightmares, anger, and anxiety people can ...
Horner's syndrome, also known as oculosympathetic paresis, [1] is a combination of symptoms that arises when a group of nerves known as the sympathetic trunk is damaged. The signs and symptoms occur on the same side (ipsilateral) as it is a lesion of the sympathetic trunk.
Anemia is one such condition and is related to an iron deficiency that makes it harder for the body to transport oxygen to cells. Heart disease can also affect energy levels. Heart disease can ...
Eventually he separated it from anxiety neurosis, though he believed that a combination of the two conditions existed in many cases. [3] In 19th-century Britain and, by extension, across the British Empire, neurasthenia was also used to describe mental exhaustion or fatigue in “brain workers” or in the context of “overstudy”. [15]
The recruits came at a trot down the Boulevard de France at the storied Marine Corps boot camp at Parris Island, S.C., shouting cadence from their precise parade ranks. Parents gathered on the sidewalks pressed forward, brandishing cameras and flags, yelling the names of the sons and daughters they hadn’t seen in three months.