Eye: structure and mechanism of vision
Sense organs · Biology
Eye anatomy lab
Interactive 3DFollow light through the eye — see how myopia and hypermetropia miss the retina.
Controls
Drag the sliders or type a value — the simulation updates live.
Study notes
In dim light your pupils widen to let more light in — then stepping into sunlight, they shrink in a second (pupillary reflex). Reading glasses for the over-40s fix presbyopia: the stiffening lens can't round up for near vision, so a convex lens adds the missing convergence. LASIK reshapes the cornea itself to correct myopia permanently.