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Valuable information can be gained from looking a victim’s pupils. For this purpose, first aid kits should have a penlight or small torch in them.
Ideally, the pupils of the eye should be equal and reactive to light, usually written down as PEARL.
To check this, ask the victim to look straight at you with both eyes. Look to see if both pupils are the same size and shape (be sensitive to those who may be blind in one eye, or may even have a glass eye, although they will usually tell you).
To check if they are reactive, take the penlight, and ask the victim to look at your nose. Briefly (5 seconds or so) shield their eye with your hand from the light source where they are (sunlight, room lighting etc.), and then turn on the penlight, positioning it off to the side of their head. Move the penlight in over their eye quickly, and watch to see the size change. A normal reaction would be the pupil getting smaller quickly as the light is shone in to it. Repeat on the other eye.
If both pupils are the same, and both react, note this on your form as PEARL, or else note down what you did, or did not see.