CIRCLES OF DISPERSION
\sˈɜːkə͡lz ɒv dɪspˈɜːʃən], \sˈɜːkəlz ɒv dɪspˈɜːʃən], \s_ˈɜː_k_əl_z ɒ_v d_ɪ_s_p_ˈɜː_ʃ_ə_n]\
Definitions of CIRCLES OF DISPERSION
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Figures produced by convergent or divergent rays upon the retina of an eye adjusted for parallel rays. In such an eye convergent rays would be brought to a focus in front of the retina, and divergent rays would be brought to a focus behind it. Whether the focus of the rays lies behind the retina or in front of it, each luminous point from the object is no longer represented by a point on the retina, but by a circle, and, as these circles overlap each other, the image is indistinct. The circles of dispersion take the form of the pupil.
By Smith Ely Jelliffe