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However, a lens designed to have negative aberration is a different matter. 35.) "Zero spherical aberration means that the power of that lens is the same in the center and at every point out to the periphery," explains Dr. "The advantage of a lens with zero spherical aberration is that if it's decentered it won't confound any existing aberrations.
Implanting an aspheric IOL avoids increasing this aberration—and an IOL with negative spherical aberration may even return the optical system to zero spherical aberration by offsetting the cornea's slight positive aberration..
Packer believes that any effect is probably insignificant.
"One study found that the mean surgically induced spherical aberration for small-incision cataract surgery is 0.03 ±0.17 µm.
In reality, the difference made by addressing asphericity is usually very small compared to correcting spherical error and astigmatism.
Certainly, asking patients to pay more for a lens only makes sense if there is a noticeable gain in visual quality. , says that many patients won't notice the difference.
So it's not clear if the average person can distinguish in that situation, either."In any case," he adds, "practical issues may make all of this a moot point, at least for the time being.