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Human Performancemedium#923

The best technique for scanning at night is:

A

staring directly at objects

B

using off-centre viewing (looking 10-20° away from the object)

Correct

C

squinting

D

using only one eye

Explanation

At night, the fovea has a blind spot (no rods), so looking slightly off-centre (10-20°) directs the image onto rod-rich areas.

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