Spherical Aberration
Correction and Vision
It's important that readers understand the benefits of
spherical aberration correction, particularly in low light
conditions.
In the general population there's about 0.15� of positive
spherical aberration at pupil diameters of about 6mm, and it
increases with increased pupil diameter. The negative impact
of spherical aberration on visual quality is most apparent
in low light conditions or at night, and is typically
reported by patients as halos or glare. Aspheric optics can
correct for spherical aberration, which is one of the
dominant high-order aberrations inherent to the human
optical system.
Bausch & Lomb's PureVision aspheric optics are engineered to
not only counterbalance the positive spherical aberration of
the human ocular system, but they're also designed to
minimize contact lens-induced spherical aberration for each
lens power.
In a recent patient survey of more than 7,000 patients
wearing PureVision:
*
83 percent said, I see objects more clearly at night.
*
80 percent said, I have better vision while driving at night
(fewer halos and glare).
*
90 percent said, I have better overall vision with their
PureVision lenses.
We believe our aspheric optic lenses successfully
demonstrate a visual benefit to patients in the research
environment, in the exam lane and in the real world.
Mike Pier, OD
Director, Professional Relations, Bausch & Lomb