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Topography (pentacam)

Topography of the eye - cornea

What is corneal topography?

Corneal topography (or corneotopography) is a non-invasive technique used to measure the curvature of surfaces. A series of focused light rings are projected onto the cornea during the procedure, the resulting image is read by a digital camera and converted into a topographic map which allows you to assess deviations from the standard. The color in the topographic map reflects the distribution of the corneal surface's refractive force (in the center and at the periphery). The various colors in the cornea topography (corneal map) reflect areas with greater or lower refractive power. The choice of colors also helps to equate the different eyes and the same eye shifts.

Using various coefficients, ophthalmologists attempt to compare the variation of the specific markers of the cornea's anterior surface obtained using topography with optical properties and the best possible visual acuity it can offer. In clinical practice, these coefficients can be used as a statistical representation of visual changes caused by defects in the anterior corneal surface. There are several explanations for this, such as the corneal surface regularity index, the corneal uniformity index, the projected corneal visual acuity, and the function of point spread.

The cornea topography, or corneotopography, is an approach that allows you to study its structure in detail.

Modern topographers use projection and elevation systems (Placido Discs), for more precise results from corneal surface studies.

One of the key functions of corneal topography nowadays is the early detection and monitoring of corneal ectasia. The review of the data supplied in aggregate helps us to achieve the most reliable test results and to agree on the most appropriate use of therapy depending on the type of astigmatism.

Corneal topography is important before refractive surgery, for cataracts, for example, it is necessary to calculate the potency of the implanted lens, as well as for keratoplasty and for corneal injuries.

None of the results of the analysis of the diagnosis of possible pathologies can be evaluated without aggregate with the rest, therefore it is very important, first of all, to evaluate the parameters of all the results as a whole.

To implement this study, the patient does not require any special training. Sufficiently good wetting of the test surface. Patients using contact lenses should postpone their use for 10-15 days before the test, in order to avoid distortion of the final results.
 

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