Accomodating patiens

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.

And being centered in the bag may not be the same as being centered in the line of sight.

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Centration is another concern that is more of an issue with some aspheric lenses.

Standard IOLs, which add positive spherical aberration to the optical system, do not create major problems if they decenter.

Are there trade-offs when we reduce or eliminate spherical aberration?

Does it make sense to try to customize asphericity for each patient?

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.

So if you're concerned that the lens may decenter after implantation because of significant pseudoexfoliation or because the capsular bag has broken during surgery, you should choose a lens that has zero spherical aberration.

Because the amount of asphericity differs among many of these lenses, it's even theoretically possible to customize the total asphericity of the visual system to meet the patient's individual needs.

However, this raises a host of practical questions: Does improving spherical aberration make a significant difference in the real world?

So in that situation, using an aspheric lens would probably make a noticeable difference." and associate clinical professor at the UCLA School of Medicine.

"Most patients are unlikely to notice the difference on the beach on a sunny day when the pupil is constricted.

"However, about two-thirds of these patients have residual refractive error between ±0.25 D and ±0.75 D.

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