School › Eyes
How eyes work
How light enters the eye, how the cornea and lens focus it, how rods and cones turn it into signals for the brain, why we have a blind spot, how glasses correct blurry vision, and how to calculate the power of the eye. Three ages, each with a text, an experiment, a game, a quiz, a printable worksheet and a teacher sheet.
Ages 6–7Look into my eyes!The pupil, the iris, the lens and the back of the eye, and how your eyes and brain work together to see. With a pupil-watching experiment.Ages 10–11Inside the eye: from light to a pictureHow the cornea, pupil, iris and lens focus light on the retina, rods and cones, three kinds of cone for colour, the blind spot, glasses and colour blindness. With a blind-spot fair test.Ages 15–16The optics of the eye: power, accommodation and correctionThe eye as a converging lens system, power in dioptres, accommodation and the near point, retinal image size, correcting myopia and hyperopia, photoreceptor spectra and the X-linked inheritance of colour vision deficiency. With a near-point and accommodation investigation.