Difference between revisions of Accommodation

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-Accommodation is the ability of the healthy eye to focus on both near and far objects.  The relaxed state of the [[ciliary muscle]] is distance vision, and the flexed state is near vision.
+'''Accommodation''' is the ability of the healthy eye to focus on both near and far objects.  The relaxed state of the [[ciliary muscle]] is distance vision, and the flexed state is near vision.
-=Presbyopia=
+Kids start with a lot of power of accommodation (about 25 D). As you age, the lens in your eye becomes less flexible, resulting in less power of accommodation, which is called [[presbyopia]], especially when it is less than 2.5 D (40 cm through distance correction).
-As you age, the lens in your eye becomes less flexible.  This makes accommodation more difficult and brings on "arms are not long enough to read" symptoms.  Someone may be both [[myopic]] and presbyopic, and have deficits to both near and far vision.  Your [[Full Prescription]] will have an "Add" section specifying bifocals or multifocals if you have diagnosed presbyopia, or if your doctor thinks it best to reduce eye strain.
-==Bifocals==
-Glasses with a lower section that is specifically for close work.
-==Multifocals==
-Contacts that have sections for near and far work, which the [[visual cortex]] will selectively use when looking at different distances.
 ==References==