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Word Definition


Observational study
Observational study

Occipital lobe

The back part of the brain that is important for vision.
The occipital lobe is a part of your brain. 

It is at the back of your brain. 

You use it to see things. 


An obstruction or a closure of a passageway or vessel.
An occlusion is something that happens in a blood vessel. 

It happens when the blood vessel is blocked.

Occupational therapist

An occupational therapist can help someone to manage day to day tasks such as dressing and showering, after a stroke. They can help people to return to work and leisure activities. OTs can also help with thinking or memory problems, and hand or arm problems.
An occupational therapist (OT) is a type of health worker. 

They can help you with day-to-day actions.

This could be: 
  • Getting dressed
  • Having a shower
  • Going back to work
  • Doing things you enjoy

An OT can help you if you have problems with your thoughts or your memory. 

They can also help with hand or arm problems.


Also spelt edema. The swelling of a cell that results from the influx of large amounts of water or fluid into the cell. If a limb doesn’t move very well, fluid may build up, causing oedema.
Oedema is when a part of your body swells up. 

If you have trouble moving your leg or arm, fluid can build up.

This fluid causes swelling. 

It is also spelt edema.


A doctor who specialises in investigating and treating eye conditions.
An opthamologist is a type of doctor.
They look after your eyes.


Odds ratio
Odds ratio


An orthoptist is a health professional with particular expertise in vision and eye movements. An orthoptist can diagnose and treat a range of abnormalities that affect eye muscles, connected nerves, eye movement, vision and alignment.
An orthoptist is a type of health worker.

They help you if you have problems seeing things or moving your eyes.


Obstructive sleep apnoea
Obstructive sleep apnoea


Occupational therapist
Occupational therapist