General Objective.

To create a suitable Index, based on Pythagoras' hypotenuse, to represent any refractive state and to facilitate statistical analyses of ametropic patients.

Methods.

3964 patients from a database of OPTILASER (Refractive Surgery Center in Bogotá, Colombia) for the year 2014 were selected to demonstrate the applicability of the proposed Index of Ametropia. The patients had not been previously subjected to any kind of surgical procedure. Another example to illustrate the applicability of the proposed Index of Refraction comes from a database of an investigation "Madre Canguro Integral" (Integral Kangaroo Mother), carried out between 2013 and 2014 at Hospital San Ignacio, Bogotá in which 311 healthy prematurely-born babies were evaluated Principal meridians of ametropias are taken as catheti of a right triangle in order to calculate the Hypotenuse which will be taken as the Index of Ametropia. Spearman Correlation, between the Index of Ametropia and the Visual Acuity expressed as the Minimum Angle of Resolution (MAR), are determined.

Results.

Spearman Correlation between the Index of Ametropia and the Minimum Angle of Resolution is 0,834 statistically significant (p: < 0,001) ample enough to validate the proposed Index of Ametropia.

Conclusions.

The Index of Ametropia is a valid instrument for the assessment, management and statistical analysis of ametropias.

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