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Age-related Normative Data of Semi-automated Kinetic Perimetry (SKP) with the INTERZEAG Octopus 101 Instrument
1Schiefer U., 1Rauscher S., 1Sadowski B., 1Hermann A., 1Nowomiejska K., 2Vonthein R., 1Schiller J.,
1Universitäts-Augenklinik Tübingen, Abt. für Pathophysiologie des Sehens und Neuroophthalmologie (Tübingen)
2Institut für Medizinische Biometrie (Tübingen)
Purpose: To assess age-related normative values using semi-automated kinetic perimetry (SKP), under consideration of individual reaction times.
Methods: By the help of a re-designed mirror unit and a completely revised user interface, integrated into an OCTOPUS 101 perimeter, a smooth, constant stimulus motion with angular velocities up to 80°/s in any direction within the entire cupola area is realised. With the help of this device, so-called "vectors" are generated, along which the pre-defined stimuli are moved by the computer program with a selected constant angular velocity. Stimulus presentation is stopped by response of the patient. For each stimulus condition, six centripetal stimuli in random order along each of the eight cardinal meridians are presented in order to estimate the scatter (standard deviation = SD) of average local responses (mean). Four additional vectors within the central visual field are used to assess and optionally correct for patients´ individual reaction time (RT) characteristics.
Results: Age-correlated normative data were obtained in altogether 84 subjects (12 per each decade). Using e.g. the Goldmann III 4e stimulus with an angular velocity of 5°/s for instance along the nasal horizontal meridian, the "kinetic thresholds (eccentricities)" are 53.7° ± 6.8° (mean ± SD), and 54.4° ± 8.0°, for the second and seventh age decade, respectively. Considering individual reaction times, these values increase to 56.8° ± 6.5°, and 57.3° ± 7.9°, respectively.
Conclusions: By the help of the new semi-automated kinetic perimetry (SKP) mode of the Octopus 101 instrument, largely examiner-independent age-related normative data of local kinetic threshold and scatter, considering individual reaction time can be obtained.