So for BiConvex Lenses, increasing the lens radius (by making the lens fatter) brings the image and focus closer to the lens, thus making it smaller given constant object position. As demonstrated in this demo http://micro.magnet.fsu.edu/primer/java/lenses/lensvariations/index.html Yet for the eye, when we want to focus on closer objects, the ciliary muscles contract to fatten the lens and that makes the image larger, not smaller? As demonstrated in this demo: http://micro.magnet.fsu.edu/primer/java/humanvision/accommodation/index.html Why are they conflicting? Are they different lenses? And while we're on the subject, increasing the refractive index of a lens definitely causes the image to focus closer to the lens right?