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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Source : www.modieyecarecentre.com
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