HOROPTER
\hˈɒɹɒptə], \hˈɒɹɒptə], \h_ˈɒ_ɹ_ɒ_p_t_ə]\
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The line or surface in which are situated all the points which are seen single while the point of sight, or the adjustment of the eyes, remains unchanged.
By Oddity Software
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The line or surface in which are situated all the points which are seen single while the point of sight, or the adjustment of the eyes, remains unchanged.
By Noah Webster.
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[Greek] A line or surface in the field of vision, of such a shape that each point of it throws images upon corresponding points of the retinae of the two eyes, and is hence seen as one point by both. It varies in character with the position of the eyes.
By Alexander Duane
By Sir Augustus Henry
By Willam Alexander Newman Dorland