Pupil dilation decreases with age

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Laboratory experiment with mobile eye tracker © MPI f. Biological Cybernetics
Laboratory experiment with mobile eye tracker © MPI f. Biological Cybernetics

Our eyesight declines with age: Poor lighting or strong contrasts between light and dark can limit the ability of older people to react in everyday life, resulting in a negative impact on the sleep-wake-rhythm. As neuroscientists at the Max Planck Institute for Biological Cybernetics in Tübingen and the University of Basel confirm, this is also due to the diminishing ability of the eye’s pupil to dilate sufficiently.

When driving in the evening, oncoming vehicles can dazzle you and impair your vision. Sometimes so badly that you can only make out the edges of the road, the road median or people. ...

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