Indentation, Applanation and Non Contact Tonometry: A Comparative Study

Abstract

A comparative study conducted on a discrete population of 130 patients all of whom attended the outpatient department of our Hospital, on a voluntary basis; with an objective to compare and contrast the objective measurement of IOP using the Schiotz indentation tonometer, Applanation tonometer and the non contact air puff tonometer in patients with various refractive errors. In our study, we conclude that; in patients with high myopia (> 6 Diopters) a Perkins Applanation tonometer reads higher than Schiotz and Air puff tonometer. In patients with Hypermetropia, Schiotz tonometer reads higher than Applanation and Air puff tonometer.