| A | B |
|---|
| light is refracted | by the cornea |
| rays enter the eye by the | pupil |
| in bright light | pupil gets smaller |
| in dim light | pupil gets larger |
| light goes through | cornea/pupil/lens |
| lens gets thicker | focus objects closer to you |
| lens gets thinner | focus objects far away |
| image in the retina | upside down |
| cells in the retina | change image to electric signals |
| electric signal to the brain | along the optic nerve |
| near-sightedness | distant objects fuzzy |
| image for near-sightedness | form in front the retina |
| correct near-sightedness | concave lens |
| far-sightedness | nearby objects fuzzy |
| image for far-sightedness | forms behind the retina |
| correct far-sightedness | convex lens |
| astigmatism | image on more than one point on the retina |
| color of the eyes | iris |
| white part of the eye | sclera |
| does most of the focussing | cornea |
