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A mathematical approach to human pterygium shape

Poster Details

First Author: B.Pajic SWITZERLAND

Co Author(s):    I. Vastardis   P. Rajkovic   F. Hafezi   B. Pajic-Eggspuehler           

Abstract Details


Pterygium is a common lesion affecting the population in countries with high levels of UV exposure. The final shape of a pterygium is the result of a growth pattern poorly understood. This manuscript provides a mathematical analysis as a tool to determine human pterygia shape.


Swiss Eye Research Foundation, Eye Clinic ORASIS, Reinach, Aargau, Switzerland


20 patients, all affected by nasal unilateral pterygia, were randomly selected from our patient database independently of sex, origin or race. We included all primary or recurrent pterygia with signs of proliferation, dry eye and induction of astigmatism. Pseudopterygia were excluded from this study. Pterygia were outlined and analyzed mathematically using a Cartesian coordinate system with two axes (X, Y) and five accurate landmarks of the pterygium.


In 13 patients (65%) the shape of the pterygia was hyperbolic and in 7 patients (35%) the shape was rather elliptical.


This analysis gives a highly accurate mathematical description of the shape of human pterygia. This might help to better assess the clinical results and outcome of the great variety of therapeutic approaches concerning these lesions.

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