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A wide range of illnesses, conditions and events can cause coma.

Iritis can cause vision problems if it is not treated.

The early responses to hypothermia will be moving around, seeking shelter, hair standing on end (goosebumps) and shivering.

The eye's complicated design means that an image can pass through its many layers and end up crisply focused on the retina.

Eye problems, conditions, vision loss, management and prevention.

A pterygium is a fleshy overgrowth of the conjunctiva that may affect one or both eyes.

Cocaine is a highly addictive illegal stimulant that has serious side effects.

Psychedelics also known as Hallucinogens target specific centres of the brain to alter its understanding of sensory input.

The nervous system helps all the parts of the body to communicate with each other.

Brain death differs from other states of unconsciousness in important ways.