Nelson, T M Additivity as a factor in the moon illusion: a short note. [electronic resource] - American journal of optometry and archives of American Academy of Optometry Jun 1972 - 524-6 p. digital Publication Type: Journal Article ISSN: 0002-9408 Standard No.: 10.1097/00006324-197206000-00011 doi Subjects--Topical Terms: AdultAstronomical PhenomenaAstronomyHumansIllusionsOptical IllusionsSize PerceptionVisual Fields