[The Gray Scale of the Octopus N1 perimetry analysis program in neuro-ophthalmology]. / L'échelle des gris ("Greyscale") du programme d'analyse périmetrique Octopus N1 pour la neuro-ophtalmologie.

The gray scale of the Octopus neuro-ophthalmologic program N1 shows the difference between actual values and age-related normality. This permits optimal visualization of slight relative scotomas. The interpolation algorithm is computed for the four individual quadrants of the visual field, enabling either lateral hemianopic or fascicular defects to be sharply delineated. In addition, the N1 program automatically provides a global, nonsectorial gray scale which is useful for demonstrating visual defects which are not delineated by either the horizontal or the vertical meridian.