What is Coreneal Topography?

examination with corneal topographyThe word "topography" derives from the meaning description of a place - estimation and visualization of the geometric characteristics of a surface. In ophthalmology, it analyses the curvature of the corneal and provides us with trusted results in just a few seconds. Corneal topography is a specialized test where the ophthalmologist extracts useful information about the curvature of the cornea, both in quantitative and qualitative terms, through colored maps of the center to the periphery of the corneal. It is a non-invasive, painless, fast and accurate imaging technique for mapping of the eye's cornea. It is an imaging method and is therefore easily repeatable with comparable results.

The different colors on a corneal map depict areas with the highest or lowest refractive power. The scale of colors helps to compare both the two of an individuals and changes that take place within the same eye. Colors such as orange and red represent convex areas of the cornea while colder colors such as blue and green represent its flatter surfaces.

Where do we use corneal topography?

eye check with corneal topographyCorneal Topography is widely used in Ophthalmology. An example of its use is for the determination of refraction, particularly in difficult cases.

It is a necessary tool for the modern ophthalmologist because it analyses both the type and amount of the keratoconus, since the topographic maps define the size, position and curvature of the cone. In refractive surgery, corneal topography provides us with pre-operative information such as when to exclude patients from surgery in case of advanced keratoconus. For those who are able to have the surgery it helps with the planning and performing of refractive treatments based on each individuals corneal surface. It is also use for post-operative checks and monitoring of the eye.

Corneal Topography is also used in cataract surgery when the patient has astigmatism besides cataracts and wants to be rid of it. The machine assists in the insertion of intraoculars and accurately determines the axis and the value of astigmatism.