ABERRATION OF SPHERICITY
\ˌabəɹˈe͡ɪʃən ɒv sfɛɹˈɪsɪti], \ˌabəɹˈeɪʃən ɒv sfɛɹˈɪsɪti], \ˌa_b_ə_ɹ_ˈeɪ_ʃ_ə_n ɒ_v s_f_ɛ_ɹ_ˈɪ_s_ɪ_t_i]\
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takes place, when the rays, as in a common lens, which pass through the centre of the lens, and those which pass near the circumference, are unequally refracted, so that they do not meet at a common focus. This aberration of sphericity in the human eye is corrected by the iris and lens.
By Robley Dunglison
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