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Objectivity measurement of visual filed by using measurement system OBER2

Kowalski P.

Journal of Medical Informatics & Technologies

2000

Vol. 1

BI 67--74

Measurement of vision fields (perimetry) is used as a part of screening tests for glaucoma, stroke and other neurological and blood vessels disorders. It may be used for disease detection and diagnosis of eye-vision damage. The idea of vision-field diagnosis, and development of suitable measurement systems is very old. The first study are based on hand shaking in front of patient eyes. This method was very primitive. First measurement instrument used for vision-field estimation was invented by von Graefe in 1856; but it was still very primitive (in fact it was a black table with white objects). Ten years later Foerster created better perimeter which used not flat table; but an arc (area of human vision field is above 90°). Nowadays common perimeters base on Goldman spherical projectors. There are two kind of vision-field measurements: kinetic (diagnosis of moved mark detection ability) and static (diagnosis of mark detection ability, with different size, brightness and position). On the market are available perimeters used for both types of measurements; for different area of measured vision field: from 30° to 90°. One of the most important problems associated with this kind of measurements is requirement of eye stable position of through all measurement time. In the case of using eye-movement system this requirement is not longer important. Using of eye-movement measurement system may be also useful for removing the second important problem – caused by patient mistakes (wrong signalized detection); it is possible because mark detection is not signalized consciously by patient but unconsciously from eye movement. Solution based on OBER2-system and computer monitor may be also cheaper than actually produced automated perimeters. OBER2-system bases on properties of infrared light reflection from the eyes. The sensors of OBER2 are small and light goggles, to be carried by the person in relatively convenient way. They measure movements of both eyes in the vertical and horizontal axis. The set of infrared light transmitters – receivers in the goggles make it possible to achieve very high sampling frequencies – up to 4kHz. Using of the goggle and computer monitor limits field of view to about 30°. The article presents technique that allows the vision field of a human eye to be determined using an Ober2 measurements system.

Badania prowadzone wspólnie przez Instytut Informatyki Teoretycznej i Stosowanej PAN oraz II Katedrę Okulistyki Śląskiej Akademii Medycznej mają na celu przygotowanie technik koniecznych dla stworzenia oprogramowania umożliwiającego dokonywanie pomiarów pola widzenia przy wykorzystaniu systemu pomiarowego OBER2. Oprogramowanie takie może pozwolić na diagnozowanie jaskry, zapalenia nerwu wzrokowego, uszkodzenia plamki żółtej, symulacji i histerii, odwarstwienia siatkówki i zwyrodnienia barwników siatkówki. Rozwiązanie oparte na komputerze klasy PC i systemie OBER2, może być rozwiązaniem stosunkowo tanim, zwłaszcza biorąc pod uniwersalność systemu pomiarowego, który może zostać wykorzystywany także do innych badań. Może to umożliwić zastosowanie systemu i przeprowadzenie badań zakresu pola widzenia także w niewielkich gabinetach okulistycznych. Celem referatu jest przedstawienie możliwości zastosowania systemu OBER2 dla badań perymetrycznych.