Depth of focus in peripheral vision

Year: 1975

Authors: Ronchi L., Molesini G.

Autors Affiliation: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: The absolute threshold of the dark-adapted eye is recorded at different eccentricities for various degrees of defocussing. An ophthalmic lens of variable power is inserted in the optical path to produce a blurred image on the retina, corresponding to that of an uncorrected myopia and hyperopia, while the central vision of the subject is accurately accommodated for 1 m. The depth of focus, defined in terms of the criterion of visibility, as suggested by Ogle, is found to increase with eccentricity. The poor sensitivity to blur of the peripheral retina is presumably a consequence of the overlap of the receptor fields at large off-axis amgles. The suggestion is made that the edge detectors, called into play by the oblique-ray astigmatism, tend to counteract the deleterious effects.

Journal/Review: OPHTHALMIC RESEARCH

Volume: 7      Pages from: 152  to: 157

KeyWords: Eye dioptrics; Peripheral Vision; Scotopic Vision; Methodology; Night vision; Normal value; Theoretical study; Vision
DOI: 10.1159/000264746

Citations: 15
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