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The effects of spaceflight on the human body are complex and largely harmful over both short and long term. [ 1] Significant adverse effects of long-term weightlessness include muscle atrophy and deterioration of the skeleton ( spaceflight osteopenia ). [ 2] Other significant effects include a slowing of cardiovascular system functions ...
Ophthalmology. Toxic and nutritional optic neuropathy is a group of medical disorders defined by visual impairment due to optic nerve damage secondary to a toxic substance and/or nutritional deficiency. The causes of these disorders are various, but they are linked by shared signs and symptoms, which this article will describe.
Mission Specialist (MS) William M. Shepherd rests his head on the stowed treadmill while Pilot Robert D. Cabana, holding Shepherd's eye open, prepares to measure Shepherd's intraocular pressure using a tonometer (in his right hand). Spaceflight associated neuro-ocular syndrome ( SANS ), [1] previously called spaceflight-induced visual ...
If you can balance on one leg for at least 10 seconds, rejoice! Chances are, you will outlive many of your peers. On the other hand, if you are over the age of 50 and cannot perform this 10-second ...
It can lead to permanent visual loss in one eye that may develop painlessly and suddenly or over several days before it stabilizes. There are currently no effective treatments for NAION.
Hold the position for 10 seconds. Then progress up to 30 seconds or 60 seconds. Switch feet and repeat. Free your hands. Lift your hands off the counter or wall and try the sequence again holding ...
A balance disorder is a disturbance that causes an individual to feel unsteady, for example when standing or walking. It may be accompanied by feelings of giddiness, or wooziness, or having a sensation of movement, spinning, or floating. Balance is the result of several body systems working together: the visual system (eyes), vestibular system ...
Optic neuropathy is damage to the optic nerve from any cause. The optic nerve is a bundle of millions of fibers in the retina that sends visual signals to the brain. Damage and death of these nerve cells, or neurons, leads to characteristic features of optic neuropathy. The main symptom is loss of vision, with colors appearing subtly washed out ...
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