Optimal interval length for visual interpolation: The effect of viewing distance

Abstract

"Two experiments were conducted to establish the optimal length of interval interpolation in tenths and to determine the effect of viewing distance on the optimal interval length. [a] Twenty-four laboratory personnel served as Ss. The six orders of presentation of the three viewing distances were each used four times and assigned to the Ss randomly. [b] Nine combinations of interval length and viewing distance were presented in random order to each of the five laboratory personnel who served as Ss. It is concluded that the "law" of the visual angle does not apply under the conditions tested… . display dimensions and viewing distance [could] be stated when specifying display size, rather than combining these dimensions and specifying display size in terms of visual angle." (PsycInfo Database Record (c) 2025 APA, all rights reserved)