Rauschfeldkampimetrie - Eine neuartige perimetrische Untersuchungsweise

Abstract

Patients with circumscribed visual field defects can perceive them while looking at a surface with small black and white spots flickering randomly at high frequency (such as the white-noise field of a TV screen following the end of transmissions for the day). This autonomous perception of scotomata can be used as a screening method, to perform subsequent manual or automatic grid perimetry with the same TV monitor, concentrating on the defective part of the visual field alone. The results of white-noise scotometry used to examine the visual fields of 161 patients are presented. It appears that the test is capable of identifying suprageniculate homonymous hemianopias, since patients either do not observe them at all in the white-noise field or only to a far lesser degree. In addition, the blind spot and some congenital visual field defects are not observed as visual field defects at all in the white-noise field. However, all acquired circumscribed defects caused by lesions of the first, second, or third neuron are readily seen in the white-noise field if the patient is capable of stable fixation.

Temporal contrast sensitivity with peripheral and central stimulation in glaucoma diagnosis

“…Other programs typically used for early glaucoma diagnosis in automated computer controlled static projection perimeters nowadays available also concentrate on the central 30° of the visual field—for example, the Octopus program G128 29 and the Humphrey visual field analyser 24-2 and 30-2 programs used for both white on white and blue on yellow perimetry 3031 Further examples for central visual field tests are the less frequently applied techniques of high pass resolution perimetry,32 white noise scotometry,33 colour perimetry,34 colour contrast perimetry,35 flicker perimetry,36 37 frequency doubling perimetry,38 and motion perimetry 39-41…”

Long-Term Fluctuation of Standard Automatic Perimetry, Pulsar Perimetry and Frequency-Doubling Technology in Early Glaucoma Diagnosis

“…Although FDT seems to act more selectively on the magnocellular system, Pulsar combines magnocellular characteristics such as temporal modulation with other parvocellular characteristics, since it seeks the threshold in the region of high spatial frequencies. One hypothesis that may explain the sensitivity of both systems to detect glaucoma could be that they present stimuli which cannot be easily transmitted along an impaired optic pathway, as once postulated by Aulhorn and Kost [37] to explain the results of white noise perimetry or the spontaneous Pulfrich phenomenon in monocular glaucoma. The velocity of nerve transmission may be insufficient for the visual cortex to assimilate these rapid stimuli, one by one.…”

From Neuron to Gestalt: Mechanisms of Visual Perception

“…One way to visualize a scotoma is by looking at a dynamic noise field (e.g., "snow" on a television screen). Under these conditions, the area corresponding to the deficit is perceived as having less contrast, being less sharp, and showing less movement [11,326).…”