Corneal topography


Corneal topography


What is a corneal topography?

Corneal topography is a type of eye examination aimed both at mapping out the anterior surface of the cornea responsible for about 2/3 of the refractive capacity of the organ itself and to get acquainted with its shape.


What is its purpose?

Corneal topography enables us to know the curvature of the anterior surface of the cornea. The examination provides a coloured map in which each color corresponds to a curvature radius. Cold colours such as blue indicate the flattest points, that is those parts with a greater curvature radius, while warm colours such as red indicate a greater curvature, hence those parts with smaller curvature radius.

A standard topography shows up an image with warmer colours in the center, while colours are colder in more peripheral areas indicating flatter ones.




Topografia corneale

Image source:


How is a corneal topography performed?

A corneal topographer is used.

It projects a series of concentric rings on the cornea and then the corneal topographer reads the reflected image in the organ itself. At this point a computer works out the image and calculates the curvatures by studying the distortion the rings have undergone.

The corneal topography is a non invasive procedure and does not require the use of eyewash. If you wear contact lenses, remember that a corneal topography can only be performed at least 24 hours after the use of soft contact lenses or 48 hours with regard to the rigid ones.


When should a corneal topography be made?


It is advisable to undergo a corneal topography when affected by keratoconus (ocular disease: corneal deformation), before a refractive surgery to understand at what point and to what extent to act with a laser, before a corneal transplant and, finally, in contactology for an evaluation of the effects of the use of contact lenses on the cornea, etc.


Ottica Chiodi performs corneal topographies for free as a preliminary check up and it always recommends a thorough examination carried out by an ophthalmologist.

Ottica Chiodi

Viale Giuseppe Mazzini, 38
64011 Alba Abriatica (TE) - Italy
Tel. +39 0861 713860
WhatsApp +39 333 7923557
P.Iva 00686160672
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