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Subscribe to Our NewsletterPrespyopia
With the passage of time, around the age of forty, the flexibility of the lens has decreased enough so that it’s hard to focus on close objects.
The crystalline lens of the eye is flexible in youth, and its adjustability is used by the focusing system to change focus from near to far and visa versa. The lens of the eye lies just behind the iris, the colored portion of the eye. It is attached to a muscle that encircles it, and changes in the tension of the muscle create changes in the shape of the lens. It’s an automatic focusing system that operates without conscious control as long as the lens is flexible.
With the passage of time, around the age of forty, the flexibility of the lens has decreased enough so that it’s hard to focus on close objects. It takes less effort to focus things farther away, and so we “push back” our reading to an area where it’s easier to focus. This marks the onset of Presbyopia, which continues over time. Most people either shift to bifocals or no-line bifocals, or use reading glasses at this point. There is no “cure” for presbyopia, and surgery is not effective for this condition.
The so-called no-line bifocal is actually not a bifocal, it’s a lens whose power progresses as you look farther down into it, and so it’s called a Progressive lens. Progressive lenses look like normal lenses and work well for near and intermediate vision. Adaptation usually takes a week or so.