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4 / 23  Why do people over 55 often need reading glasses?
A  Their cornea no longer focuses correctly.
B  Their lens no longer focuses correctly.
C  Their eyeball has elongated with age, causing images to focus in front of their retina.
D  Their retina has thinned with age, making vision more difficult.

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Source:  OpenStax, Human biology. OpenStax CNX. Dec 01, 2015 Download for free at http://legacy.cnx.org/content/col11903/1.3
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