Pre-Testing Corneal Topographer that that maps the front surface of the eye

A corneal topographer shows optometrists the shape, contour, and amount of astigmatism in the cornea. Additionally, it detects irregularities in the cornea. Moreover, corneal topography can identify irregular zones to diagnose conditions such as keratoconus, which is a corneal disease that can be diagnosed after corneal topography. Diagnosis plays a critical role in management of keratoconus, which is usually diagnosed in young adults. And then as you get older, the condition actually progressively gets worse. They can map out these changes over time when they take corneal topography.
It is also very helpful when fitting gas permeable, scleral lenses, and ortho-k lenses. For any type of specialty contact lens, corneal topography is necessary.

A corneal topographer helps optometrists determine where and how to fit you with contact lenses. Depending on the contour, certain contact lenses may be more appropriate, such as hybrid lenses, which is a combination of soft and gas permeable lenses, or custom scleral designs.
With the increase of myopia or nearsightedness in children, and the research that shows the dangers of high myopia, orthokeratology has become a very popular field in recent years. It is now possible to slow the process of a child's myopia increasing over time and control it using specialized contact lenses called orthokeratology or ortho-k. Corneal topography serves as your baseline measurement when designing an ortho K lens. Therefore, they use that on every patient who comes for ortho-k on every visit, because they want to see changes that they are promoting through the use of ortho-k contact lenses.