For corneal changes and fitting of contact lenses

Topography:

As optometrists, we like to have an accurate representation of the anterior corneal surface. This representation is used to design contact lenses, glasses, and to reshape the cornea via overnight contact lenses (ortho keratology) or surgical procedures to improve eyesight.

Corneal topography is a method of corneal curvature examination assisted by computer analysis. A corneal topographer projects a series of illuminated rings onto the corneal surface, which are reflected back into the instrument. The reflected rings of light are analysed by the computer and a topographical map of the cornea is generated. The topopgraphical map and computerised analysis reveals any distortions of the cornea, such as keratoconus or corneal scarring, as well as the corneal curvature and meridians of astigmatism. This diagnostic procedure is essential for patients wanting to remodel their cornea (orthokeratology) to eliminate or reduce thier precription non- surgically, considering refractive surgical procedures (such as LASIK) and may even be necessary in the follow-up of some patients who have undergone refractive surgical procedures.