In a normal eye, the lens—which lies behind the pupil—is
clear (transparent), so the pupil appears black. In an eye with a severe
cataract, the cataract clouds the lens. So the eye doctor sees the pupil as gray or
The cornea is the clear layer that covers the front of the
eye. The lens is contained inside the eye's lens capsule. A cataract is a
partial or complete cloudiness in the lens.
Two small cuts (incisions) are made in the eye where the
clear front covering of the eye (cornea) meets the white of the eye (sclera).
Next, a small, circular opening is made in the front of the lens capsule to allow access to the cataract. A small surgical instrument
(phaco probe) is inserted into the eye.
The probe uses sound waves (ultrasound) to break the cataract into
small pieces. Then the surgeon uses suction to remove the cataract and lens pieces from the
A variety of IOL types are available to replace your natural
lens. Your doctor can help you choose the type that may work best for
After the cataract is removed, an intraocular lens (IOL) may
be placed inside the lens capsule. The
back of the lens capsule (posterior capsule) is left inside the eye to keep the clear gel in the
back of the eye (vitreous gel), as well as the IOL, in
The intraocular lens (IOL) takes the place of the eye's
natural lens. The incision does not usually require stitches, unless the
surgeon decides they are needed.
Before cataract surgery, the cloudy lens can be seen through
the pupil. After cataract surgery, the pupil appears black because the
intraocular lens is clear.
August 24, 2011
Adam Husney, MD - Family Medicine & Carol L. Karp, MD - Ophthalmology
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