Question

why do our eyes move when we sleep ?

Answer 1

This discovery led researchers to believe the brain is switching to different mental imagery when the eyes move. Each time we move our eyes the brain forms a new mental image. The reason for REM sleep is still unknown, but processes that occur during this cycle have been shown to be vital for brain health.

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Answer 2

The capacity to change the focal length as per need, although the elastic lens can change its focal lenghr to increase or decrease it it can not do so beyond a limit