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COMPUTERIZED PERIMETRY IN FOLLOW‐UP STUDIES
Author(s) -
BYNKE H.,
HOLMIN CATHARINA,
KRAKAU C. E. T.
Publication year - 1981
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1981.tb05751.x
Subject(s) - perimeter , visual field , glaucoma , medicine , ophthalmology , stimulus (psychology) , intraocular pressure , audiology , optometry , mathematics , psychology , geometry , psychotherapist
The automatic computerized perimeter ‘Competer’ has been used in several clinical studies for detection and follow‐up in glaucomatous cases and also for the control of field defects in neuro‐ophthalmological cases. The procedure is static and the central visual field is tested at 64 fixed test points. By replacing the assistant by a computer the test conditions are kept under strict control. Time factors such as stimulus exposure time and maximal reaction time are fixed. The test result is given as the threshold sensitivity at each test point. The numerical presentation makes the results suitable for statistical analysis. By adding all 64 threshold sensitivity values the information of a test session is condensed into a single number: the performance value (P). The development of the performance value in a series of 5 consecutive perimetry sessions during more than one year (13—17 months) has been studied in a group of 55 eyes with glaucomatous field defects. The interval between 2 test sessions was 3—5 months. In 45 cases there was a tendency towards decay. The negative trend in the whole group was significantly more pronounced than that to be expected in normals where a slight tendency towards decay with increasing age is also found (Fig. 1). The tendency towards decay was similar in 2 subgroups separated with respect to the intraocular pressure (mean levels of < 22 and ≥ 22 mmHg, respectively). Similar measures have turned out to be of value in the follow‐up of field defects in neuro‐ophthalmological cases. The difference between the left and right half of the field defines the value (D) which is well suited for detection of slight hemianopias.