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A greyout is a transient loss of vision characterized by a perceived dimming of light and color, sometimes accompanied by a loss of peripheral vision. [1] It is a precursor to fainting or a blackout and is caused by hypoxia (low brain oxygen level), often due to a loss of blood pressure. Greyouts have a variety of possible causes:
Hypotension, also known as low blood pressure, is a cardiovascular condition characterized by abnormally reduced blood pressure. [1] Blood pressure is the force of blood pushing against the walls of the arteries as the heart pumps out blood [2] and is indicated by two numbers, the systolic blood pressure (the top number) and the diastolic blood pressure (the bottom number), which are the ...
This is supported by evidence that those with low blood pressure, particularly low diastolic blood pressure, are at an increased risk of glaucoma. [21] The primary neurodegeneration theory hypothesizes that a primary neurodegenerative process may be responsible for degeneration at the optic nerve head in glaucoma. [21]
A low blood pressure - whether consistently low or with sudden pressure drops - is associated with NTG as are conditions like Flammer syndrome and obstructive sleep apnea. [2] Flammer syndrome has been attributed to increase the likelihood of ganglion cell damage in normal tension glaucoma patients with disc hemorrhages as a characteristic ...
How these symptoms affect the patient depends on to which organs or body parts blood supply is inhibited. Typical symptoms of Flammer syndrome are cold hands or feet, low blood pressure, occasional white and red patches on the face or neck, and migraine-like pain or a feeling of pressure behind the upper eyelid.
The combination of anemia and low blood pressure means that the blood is carrying less oxygen to the tissues. The optic nerve can be at very high risk for damage from insufficient blood supply due to swelling (from lack of oxygen) in a confined bony space resulting in a compartment syndrome. Restricted blood flow can lead to permanent damage to ...
Blurred vision is an ocular symptom where vision becomes less precise and there is added difficulty to resolve fine details. Temporary blurred vision may involve dry eyes, eye infections, alcohol poisoning , hypoglycemia , or low blood pressure .
Initially raised blood pressure followed by lowered blood pressure as the condition progresses. [52] Severe hypoxia can cause loss of consciousness, seizures or convulsions, coma and eventually death. Breathing rate may slow down and become shallow and the pupils may not respond to light. [52] Tingling in fingers and toes [53] Numbness [53]