presbygopi - www.healthnote25.com |
Presbygopi or the old eye is caused by the lens of
the eyepiece accommodation is not working properly consequently the eyepiece
can not focus the light to the yellow point properly, so the eyes can not see
the far or near. Accommodation power is the ability of the eyepiece to bulge
and flatten. The presbyter can be overcome with a double lens containing plus
(+) and minus (-) lenses.
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