gabriel russell. presbyopia literally means: farsightedness due to ciliary muscle weakness and loss...
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Gabriel Russell
Presbyopia
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Presbyopia literally means: farsightedness due to ciliary muscle weakness and loss of elasticity in the crystalline lens. Presby: “Old man” Opia: “eye”
Presbyopia is said to occur when a person can no longer focus on near objects due to lack of lens accommodation. This condition is usu. due to aging.
What is Presbyopia?
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Lens Accommodation
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Ciliary Muscles and Lens of the Eye
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Is defined as the process in which the lens undergoes change to maintain clear focus.
Accommodation is mostly a reflex but can be consciously controlled.
Young Person Eye: Older(over 40yrs old) Eye:
Can focus from distance to 7cm Will not be able or will begin to have
in 350 milliseconds. trouble focusing on near objects.
Accommodation of the Lens
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It is the natural hardening and loss of elasticity of the optical crystalline lens .
Its not known the exact causes of Presbyopia
Most Scientist have observed it as a natural course of the aging in human beings.
Why does Presbyopia take place?
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Since Presbyopia is consider a “fixed focus/vision” status correction is the only option.
They include. *Reading Glass for patients 20/20(Normal
vision or good distance sight). *Bifocals, Trifocals, and Progressive Lens for
those who do not see well at distances or have astigmatism. (A study in BMJ (British medical journal) stated that Bifocals where linked to 35% of all falls involving the elderly)
Treatments for Presbyopia:
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The study also suggested the elderly use non-multifocus lens when traveling stairs.
Surgeries: Some claim reversal of presbyopia ( still awaiting FDA approval.
*Corneal Surgery (FDA approved)
*SRP (Surgical Reversal of Presbyopia)..in clinical trials
*IOL (Intraocular Lens Implants)…planning trials
Treatments Continued:
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Monovision: which is when one eye(usu. Dominant eye) is corrected for distance vision and the weaker eye is semi-corrected for near vision it can be done by LASIKs or Contact Lens. (Eyes must be trained/ Pres. Ronald Reagan used Monovision for speeches).
Treatments Continued
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*Presbyopia affects everyone as they age. (Onset may vary but will be seen after 40yrs of age)
*Its doesn’t discriminate
Equal Opportunity Disorder
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Make regularly scheduled Eye appointments
Remember “The 20-20-20 Rule”*Take (20)seconds, to look(20) feet away,
every 20 minutes. this will help to prevent long term damage
to eyes…particularly the crystalline lens.
Preventive Measures and Practices:
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http://www.agingeye.net/otheragingeye/presbyopia.php
www.mayoclinic.com
www.wikipedia.com
References
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What is presbyopia?
Think About This: Presbyopia and Progressive Lenses
Presbyopia Youtube.com links