The instrument seen here is an aberrometer and the technology that it provides us is known as “aberrometry." This very new technology allows us to design a scleral lens with superior optics.
Virtually every patient who has undergone refractive surgery such as LASIK, RK, PRK, etc. suffers varying degrees of visual defects known as “higher order aberrations” or HOA’s. HOA’s are complex vision disorders responsible for patients experiencing ghosting, double vision, starbursts and halos. The 2nd and 3rd images seen here show wavefront maps that are used to make a scleral lens that can eliminate these HOA’s.
Measuring these aberrations cannot be done by simply scanning the anterior surface of the cornea. In order to identify and measure these aberrations, the aberrometer seen here is used to send a light into the eye. This light passes through the cornea and the lens of the eye and is reflected back to the retina. The reflected light is then identified and measured by the aberrometer. Finally, these aberrations are displayed in 3D on the aberrometer’s computer screen. How the light passes through the eye is known as wavefront technology.
The resulting aberration profiles are uploaded to a special laboratory that embeds this information into the surface of the scleral lens so that these aberrations can be eliminated and the patient's vision improved.