Perimetric Calculator

Abstract

The paper considers the problems of the early glaucoma diagnosis before the development of the marked glaucomatous optic neuropathy. Special attention is paid to the methods of computer perimetry, which are important in diagnosing the presence or progression of glaucoma.Purpose. To create the computer program “perimetric calculator” that performs mutual recalculation of perimeter data of HFA and HEP without additional perimetric studies, as well as calculation of diagnostic information content of perimeter parameters with different “cut-off points” of HFA and HEP parameters.Patients and methods. 56 patients (85 eyes), including 16 men and 40 women aged 55 to 84 years (mean age 64.9 ± 6.4 years). All patients were divided into 2 groups: group I — 23 healthy subjects (40 eyes) without any signs of glaucoma; group II — 33 patients (45 eyes) diagnosed with the initial stage of primary open-angle glaucoma.Results and discussion. The study revealed the comparability of the standard automated perimetry (HFA) results and Heidelberg edge perimetry (HEP), determined the most informative diagnostic criterion (MD/HEP). According to the obtained results, a computer program was created, it included two modules: the first — diagnostic information content of perimeter parameters with different “cut-off points”, the second-mutual recalculation of HFA and HEP parameters.Conclusions. This computer program allows calculating the main indices of diagnostic information content of the perimeter parameters (sensitivity and specificity) at different “cut-off points”, gives the results of calculating the values of sensitivity, specificity and accuracy for at least 150 threshold values, allows performing mutual recalculation of the parameters of the standard automated perimeter (HFA) and Heidelberg perimeter (HEP).