Cliniсal aspects of static perimetry in the diagnosis of glaucoma

Relevance Technologies and research programs are constantly evolving. The latest models of computer perimeters allow for qualitative and quantitative assessment of photosensitivity defects and calculation of perimetric indices [1, 2]. To assess changes in the visual field in computer perimetry, the Single Field Analysis (SFA) protocol for Humphrey Field Analyzer (HFA) and Seven-in-One for Octopus are most often used. The forms of these programs contain the maximum amount of information on one page. In addition to the main data, the protocol contains study quality indicators, the number of false responses, and data on fixation loss. Perimetry results are presented in the form of maps of numerical deviation from the age norm, maps of defect probability, and perimetric indices [3]. All results are compared with the age norm. Perimetric indices are included in the HFA and Octopus perimeters to assess photosensitivity defects in digital values. MD (Mean Deviation) is the value of the average deviation of photosensitivity from the age norm, reflecting the overall loss of photosensitivity. PSD (Pattern Standard Deviation), or sLV (square root of Loss Variance), is the standard deviation of the pattern. It corresponds to the average value of the defect depth without taking into account MD. VFI (Visual Field Index) in HFA is an index that evaluates the general state of retinal sensitivity in percent. It allows to exclude the influence of clouded optical media. The Bebie curve in Octopus is a cumulative curve of sensitivity values ​​of all points, built in descending order of the curve threshold values, indicating local defects [4]. Static perimetry is more functional and effective in comparison with kinetic, therefore most glaucoma classifications are based on computer perimetry. To facilitate the interpretation of perimetry data, a classification by perimetric indices was proposed. In domestic ophthalmology, the classification of A.P. Nesterov and A.Ya. Bunin [5] is still used. It takes into account the results of perimetry and the state of the optic disc. Four stages of glaucoma are distinguished: initial (I), developed (II), advanced (III) and terminal (IV). Classifications of glaucoma based on a combination of the results of computer perimetry and optical coherence tomography are emerging, which can improve the situation in early diagnostics of glaucoma. Conclusion The use of modern computer perimeters makes it possible to conduct a qualitative assessment of photosensitivity defects. Key words: static perimetry; glaucoma; HFA; visual field