Biomedical Engineering Reference
In-Depth Information
A
B
Figure 7-12.
A.
Views of the cornea prior to radial keratotomy.
B.
Following radial
keratotomy, the cornea is flattened.
the refractive power of the eye and reducing the amount of ametropia. Once the
laser has sculpted the underlying stroma, the corneal cap is repositioned.
Surgical corneal implants can also be used to compensate for ametropia. The
implants can typically be removed if they are unsuccessful in providing an accept-
able correction.
A
Corneal flap
Laser
B
Corneal flap
Laser
Figure 7-13.
A.
When myopia is corrected with LASIK, the central cornea is flattened.
B.
When hyperopia is corrected with LASIK, the central cornea is steepened. (This
diagram is a simplification.)
