|LASER VISION CORRECTION PROCEDURES FOR NEARSIGHTEDNESS, FARSIGHTEDNESS AND
Refractive procedures surgically correct or reduce nearsightedness, farsightedness and astigmatism reducing or eliminating the need for
corrective lenses such as eyeglasses and contact lenses.
How the eye works:
Light from an image passes through the clear part of the eye (cornea), the
colored part of the eye (iris) and the lens, which focuses it upon the
retina. The image is then carried through the optic nerve to the brain to
create the image we see.
Nearsightedness is the inability to see objects far away. When the cornea is
too steep or the eye is too long, light rays are not in focus on the retina,
resulting in blurred vision for distant objects.
When the cornea is too flat or the eye is too short, light rays from distant
objects fall behind the retina and are blurred. Farsighted individuals need
glasses to see up close. Although distant objects appear clear, Past the age
of 40, eyeglass correction is usually required.
Astigmatism occurs when the shape of the eye is not round. If the cornea or
the eye is oval in shape (more like a football than a basketball), then light
rays are not in focus at one point on the retina. Individuals with
astigmatism squint in bright light and require eyeglasses or contact lenses
for clear vision.
Presbyopia occurs when the lens cannot focus on objects up close. As we age,
the lens inside the eye increases in size. Past the age of 40, most
individuals do not have enough room within their eye to allow the lens to
change shape and focus on near objects. As a result, reading glasses are
required for near vision.
Robert Kershner explains how the refractive laser procedures correct these common visual problems:
The goal of vision correction procedures is to reduce or eliminate the need
for corrective lenses, such as eyeglasses or contact lenses. Most people can
see 20/40 or better following these procedures (able to pass a driver's
vision test without glasses), and the majority can see between 20/20 and
20/25! Patients over the age of 40 may still require
reading glasses for close work. Individual results may vary, and some
individuals may still require eyeglasses following the procedure for some
These procedures are performed
in our laser facility as an outpatient. Typically, one day off of work
or school is all that is required on the day the procedure is performed. You will be seen
the following day in the office and may then return to normal activities.
There are no bandages and usually there is no pain with the procedure.
LASIK laser vision correction:
The excimer laser is the most recent advance in the surgical correction of
nearsightedness, farsightedness and astigmatism. This particular wavelength
of laser light is capable of removing microscopic layers of the cornea,
typically one-third the thickness of a human hair, to reshape the outer
surface of the eye. The actual application of the laser is usually less than
30 seconds per eye for most people. The laser refractive procedures are not painful and
recovery is quite rapid. The procedure will not wear off and does
not need to be repeated.
Human Hair Etched with the Accuracy of the Excimer Laser:
in-situ keratomilleusis (LASIK):
what people are SEEING after LASIK!
LASIK is the most recent advance in the use of the excimer laser for vision
correction procedures. A microkeratome is used to create a very thin flap
of the corneal surface. Dr. Kershner lifts the flap and the computer applies
the laser beam to reshape the cornea. The flap is then repositioned back onto
the reshaped cornea. In this way, the eye acts as its own bandage and by performing the procedure under the
flap instead of on top of the corneal surface such as in PRK, the risk of
scarring is minimized, there is little if any discomfort, and vision is restored
much more quickly, usually in hours rather than in days.
to view the results of people who recently had LASIK with Dr. Kershner?
Implantable Contact Lens
The ICL is presently under FDA investigational study. Unlike laser
refractive procedures, which alter the surface of the cornea, the ICL is
implanted inside the eye. Much in the same way in which a contact lens
floats on the cornea to correct vision, the ICL floats on a film of aqueous
behind the iris, in front of the natural lens, to focus light. The ICL can
correct nearsightedness, farsightedness and astigmatism. Implantation of the ICL is a surgical procedure. Because the lens is implanted within the
the eye is otherwise not changed, and the procedure is reversible.
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Kershner, M.D., F.A.C.S., A.B.E.S.
Dr. Kershner is a graduate of Boston University and received his Masters of
Science and Doctor of Medicine degrees with honors at the University of
Vermont College of Medicine. He interned in general surgery and obtained
specialty training in ophthalmology at the University of Arizona Health
Sciences Center in Tucson. He was Chief Resident of Ophthalmology and is
Clinical Professor at the University of Utah Medical Center in Salt Lake
City. Dr. Kershner has authored over two hundred scientific articles and
twelve textbooks on eye microsurgery and lectures internationally on eye
microsurgery. Dr. Kershner has performed thousands of refractive vision
correction procedures in Tucson since 1981. Dr. Kershner is certified by the
American Board of Ophthalmology, is a Member of the Board of the American
College of Eye Surgeons and is a Fellow of the American College of Surgeons.