As your eyes age, their lenses become less flexible, and they slowly lose their ability to focus on nearby objects. It's an ongoing, lifelong process called presbyopia, which you begin to notice between ages 40 and 45, when the condition starts to affect close-up tasks such as reading. It requires some attitude adjustment, especially if have to start wearing glasses for the first time. Presbyopia affects almost everyone over the age of 50.
Until now, you could choose your own working distance: You could hold things wherever you wanted, and your eyes would adjust. But eyeglass lenses can't mimic what the eyes actually do. Glasses can help you focus, but they don't have the depth of focus your eye muscles provide.
So, even with glasses, you may still have to adjust to compensate for vision changes. That may mean holding reading material at a certain distance, raising or lowering your eyes or moving your computer terminal.
Lenses can help
Fortunately, there are corrective lenses that can make those adjustments less complicated. Lightweight lenses put the correction in your glasses exactly where you need it for your comfort.
Single-power lenses correct for only one visual deficiency such as nearsightedness, farsightedness or astigmatism. Glasses worn only for reading are an example of single-power lenses. People with more than one vision problem need multi-focal lenses.
The most common solution for reading glasses is the bifocal, a lens with two different prescriptions. The one on the lower half is your reading prescription; the one on the upper half is your prescription for distance vision.
Trifocals have distance correction on top, reading correction on the bottom and a band of "intermediate vision" in the middle, for seeing things at arm's length. Intermediate vision correction can be helpful for people who spend a lot of time working at a computer terminal.
An option that is becoming popular is to wear task-specific lenses you keep at your desk and wear only for working on your computer. Many people don't like to have to change glasses if they're up and down from their desks a lot, but it's a positive solution for some people.
Here's how you can further ease your vision adjustment:
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