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https://www.google.com/search?q=types+d%27aberration+dioptre&espv=2&biw=1242&bih=585&source=lnms&tbm=isch&sa=X&ei=LJkbVaOcDtLpaNregsAF&ved=0CAYQ_AUoAQ#imgdii=8XtEiXLr6F8uRM%3A%3BBJJAPltFpRi78M%3B8XtEiXLr6F8uRM%3A&imgrc=8XtEiXLr6F8uRM%253A%3BwcAVcBXrUuyStM%3Bhttp%253A%252F%252Fwww.optique-ingenieur.org%252Ffr%252Fcours%252FOPI_fr_M03_C03%252Fres%252Ffig05.jpg%3Bhttp%253A%252F%252Fwww.optique-ingenieur.org%252Ffr%252Fcours%252FOPI_fr_M03_C03%252Fco%252FContenu_04.html%3B498%3B694
http://www.donkikon.com/science-sante/la-bio-retine-pour-voir-comme-un-terminator/