The first surface that light entering the eye encounters is the front of the cornea, the clear, dome-shaped window which covers the iris. Because the cornea provides a major part of the focusing power of the eye, an accurate analysis of its shape and curvature is important in contact lens design or evaluating changes resulting from various disease processes.
A topographical map of the cornea is invaluable in evaluating changes to the corneal curvature that are a hallmark of some conditions like keratoconus, where the cornea begins to become thinner in some areas and tends to bulge outward. Keratoconus is usually treated with rigid contact lenses which help stabilize the corneal curvature and push it back into a more spherical shape; topographical maps are extremely helpful in designing the lenses and evaluating their effectiveness over time.
Refractive surgery is another area where topography is important in planning the type of surgery. In LASIK, corneal tissue is removed by the laser, giving it a flatter profile; topography helps determine how much.
In cataract extraction surgery or clear lens extraction, topography helps determine the power of the implanted lens that replaces the natural lens behind the iris where the cataract is located. In most cases of cataract surgery, the implanted lens allows the patient to see much more clearly than before, even without corrective eyewear. Most people are much less dependent on their eyeglasses than previously.
Technology over the past few years has taken giant leaps forward, and provides eyecare practitioners and other health care professionals with options for treatment that were never available before. Better technology from better measurements from better instrumentation equates to better outcomes in just about every area of health care.
Corneal topography is just one aspect of this forward trend, and it is a significant one without doubt. If or when you have it done, take a few minutes to look over your topographical corneal maps, because it is quite interesting.
The optomap system captures nearly 80% of your retina in a panoramic image whereas a normal eye exam only captures 15% of the retina.
this cutting edge technology allows dr. west to diagnose and treat the earliest signs of disease in your retina.
the optomap is fast, painless, and comfortable and normally does not require pupil dilation. ask about the optomap for your next eye exam.
Below is a just a few of the many issues the optomap has detected in our patients ocular examinations:
- diabetic retinopathy
- retinal detatchment
- retinal plaques and clots
- retinal holes and tears
- macular degeneration
- posterior vitrous detachments
- retinal nevus and melonoma