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
Parallel rays from a distant object refract at the cornea (~+43 D) and crystalline lens (~+20 D), focusing on the retina 24 mm behind. In myopia the eyeball is too long — focus falls in front of the retina; in hypermetropia it's too short — focus falls behind. Switch conditions to see the rays miss.