EYE DISEASES  
PRESBYOPIA
 

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Presbyopia is a normal process of aging, where the natural (crystalline) lens of the eye loses its flexibility to focus at near tasks. This usually occurs at the age 40-50, even if you have never had a vision problem before.  Near or longsighted people will notice that their near vision blurs when they wear their usual eyeglasses or contact lenses to correct distance vision and those who never needed glasses before may require reading glasses.

Causes

Presbyopia is a natural part of the eye’s aging process. It differs from nearsightedness, farsightedness and astigmatism which are related to the shape of the eyeball or are due to genetic and environmental factors. Presbyopia generally stems from a gradual thickening and loss of flexibility of the natural lens inside your eye. This makes the lens harder and less elastic over time. Thus, the eye has a harder time focusing up close.

 

.Symptoms:

  • Holding books, newspapers and other reading material at arm's length or further to focus properly
  • Near work, such as embroidery or handwriting may cause headaches, eye strain or fatigued


Treatment

  • Bifocals: The most common correction for presbyopia. Bifocal glasses combine two prescriptions: the main part of the lens for distance vision, and the lower one for close work.

  • Progressive addition lenses (PALs): Similar to bifocal lenses, they offer a more gradual visual transition between the prescriptions, with no visible line between them.

  • Reading glasses: Unlike bifocals and PALs which are mostly worn throughout the day, reading glasses are usually worn only during near work or task. For contact lens users, reading glasses can be prescribed while you are wearing your contact lenses. You can get over-the-counter reading glasses at retail stores, or higher-quality ones from your eye doctor or optometrist.

  • Multifocal contact lenses: Another type of contact lens correction for presbyopia is monovision, in which one eye wears a distance prescription, and the other wears a prescription for near vision. The brain learns to favor one eye or the other for different tasks.
    The human lens continues to change as you grow older, so check regularly with your eye care practitioner for increase in your presbyopic prescription.