A cataract is a clouding of the lens of the eye. It is a natural process and happens
as we age. Most people will develop some form of cataract as they grow older, but
there are many variables which can hasten cataract development. Common risk factors
for earlier cataracts include family history, nutrition, sunlight exposure, prior
eye surgery or diseases, eye trauma, and systemic diseases such as diabetes. If
a cataract is present, the decision to proceed with cataract surgery depends on
both the ophthalmology exam and the patient’s visual needs.
Cataract surgery has seen great advancements over the past decade, and has become
one of the most delicate and technologically advanced areas of surgery. The University
of Florida Eye Institute offers advanced cataract surgery techniques in its ambulatory
surgery center. Several qualified, board-certified ophthalmologists routinely perform
this procedure at the UF Eye Institute.
Not all cataracts are the same. Some common forms of cataract include:
- Anterior subcapsular
- Posterior subcapsular
- Toxic or drug induced
Evaluation and Diagnosis
Patients with cataracts will usually note decreased, blurry or even dull vision.
They may experience glare from lights or loss of color saturation.
The diagnosis of a cataract is typically done with a slit-lamp exam. The eye is
examined with a special microscope to evaluate any changes in the natural clarity
of the lens. It is important that the entire eye is examined, including the retina,
to make sure that there are no other diseases or abnormalities that might be causing
In some circumstances, additional tests are done to evaluate the vision in a patient
affected by a cataract. These tests include:
Potential acuity estimation - Laser interferometry and the potential
acuity meter are two methods of determining the visual potential of an eye before
cataract surgery. These tests can be useful in patients affected by cataracts and
other ocular diseases. For example, if a patient has macular degeneration and a
cataract, such tests can help estimate what portion of the visual loss is due to
the macular degeneration versus the cataract. This will help the patient and physician
estimate the potential benefit of undergoing surgery. The potential acuity meter
is the more commonly used test. It projects a vision chart through the pupil and
around any cataract opacities, directly to the retina.
Glare testing - Cataract patients often complain of significant
visual problems with glare. Even though their vision may be functional in standard
lighting conditions, they may have more significant visual disabilities when affected
by brightly lit environments or lights. A classic example is loss of vision due
to glare when approaching oncoming car headlights while driving at night. An eye
care professional may want to assess the visual function under glare conditions
to better document how the vision has been affected by a cataract.
Patients with a cataract should undergo a complete eye exam to rule out other causes
of visual loss, such as macular degeneration,
a disorder that affects the central part of the retina of the eye causing decreased
vision and possible loss of central vision, or glaucoma,
a disease of the nerve that carries visual information from the eye to the brain.
If the primary cause of vision loss is determined to be the cataract, treatment
options are limited and include observation, wearing new glasses to improve vision
or surgery. There are no eye drops or nutritional supplements that are known to
remove cataracts. In addition to decreased visual acuity, patients sometimes choose
to have cataract surgery because of problems with glare, loss of contrast sensitivity,
changes in the focusing power of the eye or double vision.
Cataract surgery is routinely performed with the patient awake. Special medications
are placed behind the eye with a nerve block or topical solution on the eye. These
medications numb the eye so that the surgeon can make a small incision and carefully
remove the cataract. While ultrasound vibrations generally are used to remove cataracts,
there are some cases in which the cataract is removed manually. Once removed, a
new lens made of special plastic material can be placed in the eye. The patient
is usually home the same day.
Frequently Asked Questions
Does cataract surgery hurt?
Not typically. Most cataract surgery is performed under topical anesthesia. This
means the patient is awake and the eye is numb. The patient may feel some pressure
and movements, but does not experience sharp pain. If the patient does experience
discomfort, the physician can immediately add more numbing medications.
How long does cataract surgery take?
The whole process from beginning to end takes about half a day. This includes check
in, pre-operative assessment, surgery and post-operative care. The surgery takes
about 30 minutes.
Is it risky?
Cataract surgery is generally considered to be a relatively safe and effective surgery.
However, like any surgery, there are unique risks. More common risks include infection,
glaucoma, inflammation, retinal detachment, and the inability to place an intraocular
lens at the time of the initial surgery.
How long is the recovery time?
Patients usually notice improvement in their vision within days. However, due to
the delicate nature of eye surgery, patients are asked to take certain medications
and restrict strenuous activities for several weeks.