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
Word of the day
basidiomycota
- comprises fungi bearing the spores on basidium: Gasteromycetes (puffballs); Tiliomycetes (comprising orders Ustilaginales (smuts) and Uredinales (rusts)); Hymenomycetes (mushrooms; toadstools; agarics; bracket fungi); in some classification systems considered a division of kingdom comprises fungi bearing spores on a basidium; includes Gasteromycetes (puffballs) Tiliomycetes comprising the orders Ustilaginales (smuts) and Uredinales (rusts) Hymenomycetes (mushrooms, toadstools, agarics bracket fungi).