Patients who are not good candidates for multifocal IOLs may be better suited for monofocal IOLs, which can offer improved functional vision postoperatively.

Aspheric Monofocal IOLs such as the Tecnis, AcrySof IQ, and SofPort AO (Bausch & Lomb) are designed to reduce overall spherical aberration, but each lens does this in a different way. The IOLs are specifically designed to neutralize all corneal spherical aberration in the average cornea. In a young eye, negative spherical aberration of the crystalline lens balances positive spherical aberration of the cornea . Young eyes have little spherical aberration, and light is sharply focused on the retina, producing a quality image and good functional vision.

Aspheric IOLs

Traditional intraocular lenses have a spherical optical design, meaning the front surface is uniformly curved from the center of the lens to its periphery. Though a spherical IOL is relatively easy to manufacture, this design does not mimic the shape of the natural lens inside the eye, which varies in curvature from center to periphery. In other words, the eye's natural lens is aspheric ("not spherical").

Why is this important?

A spherical intraocular lens can induce minor optical imperfections called higher-order aberrations (HOAs), which can affect quality of vision, particularly in low-light conditions such as driving at night.

Premium aspheric IOLs, on the other hand, match more closely the shape and optical quality of the eye's natural lens, and thereby can provide sharper vision — especially in low light conditions and for people with large pupils.

Popular aspheric IOLs that are FDA-approved and available world include: Tecnis Aspheric (Abbott Medical Optics), AcrySof IQ (Alcon), SofPort AO (Bausch + Lomb), and Aspina (Zeiss).

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