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Figure 6 | Journal of NeuroEngineering and Rehabilitation

Figure 6

From: Recovery of visual fields in brain-lesioned patients by reaction perimetry treatment

Figure 6

Change of threshold curves within a 67 months post traumatic interval. Large image. Incremental thresholds along a circle of 50 deg eccentricity (zenith angle Φ) of the treated upper right VF quadrant in a patient (# 20) suffering from a bilateral infarction of the posterior cerebral arteries and a simultaneous infarction of the left thalamus at different times after CVA. CVA 1 month after bilateral insult, immediately before the beginning of treatment with LRP. 10, 16, 34, 45, 67 refer to measurements at post traumatic interval (PTI) months after CVA. Open circles = 1 month after CVA Filled circles = CVA + 10 months at the end of treatment phase 1 (= 11 months after CVA) Open triangles = CVA + 16 months Filled squares = CVA + 34 months Open stars = CVA + 45 months Filled stars = CVA + 67 months. Abscissa = polar (or azimuth angle) Θ [deg] 0 = right horizontal meridian 90 = upper vertical meridian Ordinate = incremental (luminance) threshold T = ΔL/L, background luminance L = 3,2 cd/m2, stimulus duration Δ t = 200 ms, circular stimulus ; = 112', stimulus color = white. Small image. Subjective brightness estimation, and VF borders of threshold, brightness and form perception within a part of the central VF of pat #20 with accentuation of the treated (phase 1) upper right VF quadrant. CS central comparison stimulus (subjective brightness : 100) CVA VF border on eccentricity circle Φ = 50° when measured by incremental thresholds T one week after CVA symbols VF border (incremental threshold T) as in large image 67 VF border (incremental threshold T) 67 months after CVA 67 months PTI ( and curve of filled squares) subjective brightness estimation curve "100 %" (= to brightness of CS) 67 months after CVA b VF border (brightness perception) measured by kinetic perimetry 67 months after CVA f VF border for form perception (100% correct discrimination of white circles and squares of equal size and luminance measured by kinetic perimetry.

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