Difference between revisions of Presbyopia

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Presbyopia is the hardening of the [[lens]] in the [[eyeballs]] such that it becomes difficult to see [[near work]]. This is common in older adults and is commonly treated with [[reading glasses]] or [[bifocals]].

Presbyopia is the hardening of the [[lens]] in the [[eyeballs]] such that it becomes difficult to see [[near work]]. This is common in older adults and is commonly treated with [[reading glasses]] (reduced minus for myopes), progressive lenses, or [[bifocals]].

==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 in both near and far vision. Your [[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.

===Two glasses===

It is an option to have two pairs of glasses, one for close-up, and one for distance, instead of trying to combine both near and far corrections in one pair of glasses.

===Bifocals===

Glasses with a lower section that is specifically for close work.

===Progressive lenses===

Glasses with a gradient from zero to near plus addition spherical power from top to bottom.

===Multifocals===

Contacts that have sections for near and far work, which the [[visual cortex]] will selectively use when looking at different distances.

== Measuring ==

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The '''power of accommodation''' is (near power) - (far power). With the first example in each of the above, it would be 10 D - 1.5 D = 8.5 D.

A person is generally considered to have presbyopia [[wikipedia:if and only if | iff]] his power of accommodation is less than 2.5 D.

===Caveats===

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[[Category:Articles]]

[[Category:Eye conditions]]

== See also ==

* [[Varilux]] , Essilor progressive lens brand: the 1959 trial data, the Minkwitz constraint, and documented fall risk.

@@ Line 1: / Line 1: @@
-Presbyopia is the hardening of the [[lens]] in the [[eyeballs]] such that it becomes difficult to see [[near work]].  This is common in older adults and is commonly treated with [[reading glasses]] or [[bifocals]].
+Presbyopia is the hardening of the [[lens]] in the [[eyeballs]] such that it becomes difficult to see [[near work]].  This is common in older adults and is commonly treated with [[reading glasses]] (reduced minus for myopes), progressive lenses, or [[bifocals]].
+==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 in both near and far vision.  Your [[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.
+===Two glasses===
+It is an option to have two pairs of glasses, one for close-up, and one for distance, instead of trying to combine both near and far corrections in one pair of glasses.
+===Bifocals===
+Glasses with a lower section that is specifically for close work.
+===Progressive lenses===
+Glasses with a gradient from zero to near plus addition spherical power from top to bottom.
+===Multifocals===
+Contacts that have sections for near and far work, which the [[visual cortex]] will selectively use when looking at different distances.
 == Measuring ==
@@ Line 15: / Line 30: @@
 The '''power of accommodation''' is (near power) - (far power). With the first example in each of the above, it would be 10 D - 1.5 D = 8.5 D.
+A person is generally considered to have presbyopia [[wikipedia:if and only if | iff]] his power of accommodation is less than 2.5 D.
 ===Caveats===
@@ Line 34: / Line 51: @@
 [[Category:Articles]]
 [[Category:Eye conditions]]
+== See also ==
+* [[Varilux]] , Essilor progressive lens brand: the 1959 trial data, the Minkwitz constraint, and documented fall risk.