title: [The annular scotoma and jack-in-the-box phenomenon in aphakia corrected with eyeglasses. Experimental approach].
abstract: An experimental study of "annular scotoma" was conducted. Variations in prismatic effects at the boundary of the lens with respect to incidence were evaluated with the aid of a laser beam. The use of an arc-perimeter and an artificial aphakic eye allowed reconstruction of light beam paths from the outside to the inside of the eye. The results obtained enabled a more rigorous analysis of this optical phenomenon. A straightforward formula obtained from the experiment (tan theta = b/a) provided better understanding of the variations generated by certain parameters. This same formula can be applied to the mechanism of the "Jack-in-the-box" phenomenon.
mesh_terms: D001036:Aphakia, Postcataract / Q000503:physiopathology / Q000628:therapy*; D005139:Eyeglasses; D006801:Humans; D055095:Optics and Photonics; D012607:Scotoma / Q000209:etiology*; D058609:Visual Field Tests; D014794:Visual Fields
vernacular_title: Le "scotome annulaire" et le phénomène de "jack-in-the-box" de l'aphake corrigé par lunettes. Approche expérimentale.