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For any of these exams, you may have to get your pupils dilated to give your doctor a better view. Your doctor will put drops in your eyes and wait for about 20 minutes for them to take effect.

But when the pupils dilated, the brain switched gears and began replaying older, already-stored memories. This alternating pattern prevented interference between new and old information.

You will be asked to read letters on a chart in front of you. The eye specialist will then apply eye drops to dilate your pupils. These can sting temporarily and blur your vision. Once the eye ...