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Presbyopia
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====Corrective lenses==== [[Corrective lenses]] provide vision correction over a range as high as +4.0 diopters. People with presbyopia require a convex lens for reading glasses; specialized preparations of convex lenses usually require the services of an optometrist.<ref>{{cite journal |pmid=16597675 |date=Apr 2006 |last1=Li |first1=G |last2=Mathine |last3=Valley |last4=AyrΓ€s |last5=Haddock |last6=Giridhar |last7=Williby |last8=Schwiegerling |last9=Meredith |title=Switchable electro-optic diffractive lens with high efficiency for ophthalmic applications |volume=103 |issue=16 |pages=6100β4 |issn=0027-8424 |doi=10.1073/pnas.0600850103 |journal=Proceedings of the National Academy of Sciences of the United States of America |first2=DL |first3=P |first4=P |first5=JN |first6=MS |first7=G |first8=J |first9=GR |last10=Kippelen |first10=B. |last11=Honkanen |first11=S. |last12=Peyghambarian |first12=N. |pmc=1458838|display-authors=8 |bibcode=2006PNAS..103.6100L |doi-access=free }}</ref> [[Contact lenses]] can also be used to correct the focusing loss that comes along with presbyopia. [[Contact lens#Correction of refractive error|Multifocal contact lenses]] can be used to correct vision for both the near and the far. Some people choose contact lenses to correct one eye for near and one eye for far with a method called [[monovision]].
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