Presbyopia is a normal part of the aging process and usually occurs about the age of 40. As the body matures, the normally soft, flexible focusing lens becomes hard and has difficulty focusing on close objects. Reading vision becomes blurred and difficult. Reading glasses or bifocal lenses are required for reading and to see close objects clearly.
Normally, small fibers inside the eye, attached to the focusing lens, stretch or contract to change the shape of the lens and consequently its focus between near and distant objects. As the soft flexible lens hardens with age, the small fibers lose their ability to change the lenses shape and close vision becomes blurred.
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