tunnel vision is a medical condition that results in a loss of peripheral vision. as a result the patient can only see objects from within a circular field. this condition has many possible causes including problems in the brain some eye diseases hallucinogenic drugs and certain extreme activities. blood loss to parts of the brain can lead to tunnel vision as can a tumor pressing against the optic never fibers. a person who is exposed to air that has been contaminated by oils and hydraulic fluids such as may happen in an airplane and during hard exercise may also develop this condition. becoming ill while in an aircraft can cause temporary vision problems. the pressure placed on the optic nerve causes the eye to lose retinal ganglion cells which can eventually cause the patient to go blind. for some patients a loss of peripheral vision may be experienced prior to blindness.
after hard phys exercise sometimes get bad tunnel vision and a big ball of light right where i try to focus my eyes. why? . i've got a heart murmour and my mum dad and all 4 grand parents had diabetes. not a good start! drama is that after particularly cheeky physical exercise i sometimes get really bad tunnel vision and what seems like a big ball of light right where i'm trying to focus feel dizzy and like i've got pins and needles in both hands. lasts for about 2 hours then goes back to normal. asked the med centre on camp and they have no idea.