Visual depth of focus measured for various colored displays
Year: 1986
Authors: Ronchi L., di Fraia L.
Autors Affiliation: Istituto Electrotecnico della 1° Università Napoli, Italy
Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy
Abstract: The proper focussing of a display on the retina is one of the basic prerequisites for a good quality image. The question arises how large is the dioptre range allowing sharp vision of a multicolored display. The effect of the spread of monochromatic images due to the eye chromatic aberration is mitigated partly by the width of spectral band covered by the emission of the phosphor, partly by the existence of the depth of focus of the eye. An experiment is described in which the insensitivity to defocus is recorded fot presbyopic eyes, that is, by the use of subjects over the age of 50, whose eyelens ability to accommodate is strongly reduced, so that the range of clear vision is mainly limited by the depth of focus of their eye. For single-color displays, this range is found to be about one dioptre for some displays, about two dioptres for others. In the case of multicolored displays, the overlap of sharpness ranges for various colors covers less than half a diptre. The effect of pupil size in relation to illuminance at the eye, due to both dispaly and environment, is also considered. Above, say, 100 lux, the depth of focus of single-color displays may even be as large as three dioptres.
Journal/Review: COLOR RESEARCH AND APPLICATION
Volume: 11 Pages from: S52 to: S56
KeyWords: vision; colored display; Connecting to view paper tab on IsiWeb: Click here