ABERRATION OF REFRANGIBILITY
\ˌabəɹˈe͡ɪʃən ɒv ɹɪfɹˌand͡ʒəbˈɪlɪti], \ˌabəɹˈeɪʃən ɒv ɹɪfɹˌandʒəbˈɪlɪti], \ˌa_b_ə_ɹ_ˈeɪ_ʃ_ə_n ɒ_v ɹ_ɪ_f_ɹ_ˌa_n_dʒ_ə_b_ˈɪ_l_ɪ_t_i]\
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exists, when, as in a common lens, the rays that pass near the circumference of the lens are decomposed, so that a coloured image is observed. This aberration in the human eye is corrected by the iris, which does not permit the rays to fall near the circumference of the lens, and also by the crystalline lens itself, which, owing to its structure, serves the purposes of an achromatic glass.
By Robley Dunglison
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dust storm
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