Presbyopia is an age-related eye condition that makes it more difficult to see very close. It is the gradual lossing of your eyes' ability to focus actively on nearby targets. It is a condition where, with age, the eye exhibits a progressively diminished ability to concentrate on close objects. Presbyopia’s exact mechanisms are not recognized with certainty; the research evidence most strongly supports a loss of elasticity of the crystalline lens, although changes in the lens curvature from continual growth and loss of power of the ciliary muscles (the muscles that twist and straighten the lens) have also been posited as its reason. Like gray hair and wrinkles, presbyopia is a symptom caused by the natural form of aging. The initial signs of presbyopia – eye strain, difficulty seeing in dim light, problems focusing on little targets and/or fine print – are commonly first noted between the ages of 40 and 50.
PRESBYOPIA SYMPTOMS AND SIGNS
Signs and symptoms include
• Hard time reading small print
• Having to hold reading material farther than arm's distance
• Problems seeing objects that are close to you
• Eye strain
Everyone has some loss of focusing power for close objects as they age, only some will notice this more than others. Anyone over the age of 35 is at risk for developing presbyopia.
Presbyopia is caused by an age-related process. This differs from astigmatism, nearsightedness and farsightedness, which are referred to the condition of the eyeball and are caused by genetic and environmental agents. Presbyopia generally is thought to stem from a gradual thickening and loss of flexibility of the natural lens within your eye. These age-related changes take place within the proteins in the lens, pulling in the lens harder and less elastic over time. Age-related changes also take space in the muscle fibers surrounding the lens. With less elasticity, the eye has a harder time focusing up close.
• Contact Lenses
Eyeglasses are the simplest and safest means of correcting presbyopia. To help you correct for Presbyopia, your optometrist can prescribe reading glasses, bifocals, trifocals or contact lenses. Because presbyopia can complicate other common vision conditions like nearsightedness, farsightedness and astigmatism, your optometrist will find the specific lenses to permit you to look clearly and comfortably. You may simply need to wear your spectacles for close work like reading, but you may discover that wearing them all the time is more convenient and beneficial for your sight needs. Because the effects of presbyopia continue to alter the power of the crystalline lens to concentrate properly, periodic changes in your eyewear may be necessary to keep open and comfortable sight.
CONDUCTIVE KERATOPLASTY AND MONOVISION
Surgical alternatives to treat presbyopia also are available. If you have clear distance vision and your sole problem is poor near vision due to presbyopia, conductive keratoplasty is performed on just one optic. This produces a mild form of , meaning that one eye is adjusted for near vision while the other eye is stronger for distance sight. While CK can improve near vision, the procedure doesn't make as much blurring of distance vision as monovision with contact lenses or laser vision correction procedures. Prior to a conductive keratoplasty procedure, your eye doctor may urge that you first wear a contact lens for near vision correction in one eye for a period of time to attain certain you are able to adjust to.
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