• Vision

Clinical testing of visual fields is usually done by confrontation. Formal perimetry may then be performed to document any abnormality. Several variations of confrontation visual field tests have been described, but all are insensitive at detecting visual field loss when performed individually.1 Combining confrontation tests may improve sensitivity.

You can test visual fields quickly and easily in a co-operative patient using a laser pointer and a wall. You should sit next to the patient at least 2 m away from a blank wall on which a small target is visible. You both close (or cover with your hand) your right (or left) eye and look at the target. You then shine the laser pointer …