DILLON, D J Quantal determination and statistical evaluation of absolute foveal luminosity thresholds and of thresh old variability. [electronic resource] - Journal of the Optical Society of America Dec 1958 - 877-83 p. digital Publication Type: Journal Article ISSN: 0030-3941 Standard No.: 10.1364/josa.48.000877 doi Subjects--Topical Terms: AnimalsFovea CentralisHumansRetina--physiologySharksVision, Ocular