Eye lens replacement accommodating
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In the past, doctors had to make a relatively large incision in the clear capsule that contains the natural lens.
Cataracts form when the normally transparent lens of the eye turns cloudy.
Progress in the field has been nothing short of astonishing, experts say, starting with the development of artificial lenses about 30 years ago.
“In the early days, all we could do was remove the cataractous lens,” said Dr. Egbert, director of the Cataract Service at Stanford University.
Stuart Mc Kinnon, director of ophthalmology and neurobiology at Duke University School of Medicine.
“You do cataract surgery and afterwards they can see perfectly.
One design presents two images to the retina, one focused close and the other at a distance.
The brain then chooses which one to “see.” The second design, called an accommodating lens, incorporates a kind of hinge that allows eye muscles to focus the lens either near or far.
The most common are monofocal lenses, which focus vision at a single distance, the way a pair of standard glasses does.
Before surgery, ophthalmologists test the eyes to choose the best prescription for the artificial lens, based on whether patients are nearsighted or farsighted or have normal vision.
Marian Macsai, professor and vice chairman of the department of ophthalmology at Northwestern University Feinberg School of Medicine.
“But in the hundreds and hundreds of patients who’ve opted for these lenses, I haven’t had anyone ask me to take them out.
“For people who wear bifocals, the new lenses can mean being much less reliant on glasses, and in some cases eliminate the need for them entirely,” said Dr. Chang, a clinical professor of ophthalmology at the University of California, San Francisco.