Application du perimetre statique de goldmann au releve topographique des seuils differentiels de luminance pour de petits objets colores projetes sur un fond blanc: I—Principes, calibrage de l'appareil et etude comparative de groupes de sujets normaux d'ages differents çois.

Abstract

The authors first review some fundamental notions concerning the increment thresholds of an isochromatic or heterochromatic object of small angular extent projected on a large luminous background. The topography of such thresholds can be studied by means of Goldmann's static perimeter, of which the basic features and the spectrophotometric calibration are described. The examination of the relative achromatic sensitivities to white, blue, green and red objects along the horizontal meridian of 68 normal eyes, which were subdivided in three groups of different mean ages, allows us to recognise marked differences amongst these relative sensitivities according to eccentricity and to age; these variations are put into relationship with modifications of the spectral curve of relative luminous efficiency.