Eye health: Presbyopia and your eyes
Presbyopia is part of the natural ageing process of the eye, and can be easily corrected. Technically, presbyopia is the loss of the eye's ability to change its focus to see objects that are near. It is not a disease. It's as natural as wrinkles, and it affects everybody at some point in life. Presbyopia generally starts to appear around age 40.
Presbyopia is often confused with long-sightedness, but the two are different. Presbyopia occurs when the eye's lens loses flexibility. Long-sightedness occurs as a result of the shape of the eyeball, which causes light rays to bend incorrectly once they have entered the eye.
What are the symptoms of presbyopia?
Symptoms of presbyopia include:
- Blurred vision at a normal reading distance.
- The need to hold reading material at arm's length.
- Headaches from doing close work.
How is presbyopia diagnosed?
An optometrist can diagnose presbyopia by performing a thorough eye examination.
How is presbyopia treated?
Presbyopia cannot be cured. Instead, prescription glasses, contact lenses, reading glasses, progressive addition lenses, or bifocals can help correct the effects of presbyopia. Bifocals are often prescribed for presbyopia. Bifocals are eyeglasses that have two different prescriptions in one spectacle lens. The main part of the lens contains a prescription for short-sightedness or long-sightedness, while the lower portion of the lens holds a stronger prescription to help a person see objects up-close. Progressive addition lenses are similar to bifocals but have a more gradual transition between the two prescriptions.
Contact lenses used to treat presbyopia include multifocal lenses, which come in soft or gas permeable versions, and monovision lenses, in which one eye wears a lens that aids in seeing objects at a distance, while the other has a lens that aids in near vision.