level: The eye
Questions and Answers List
level questions: The eye
| Question | Answer |
|---|---|
| structure of the eye diagram | here |
| what does the cornea do? | refract the light |
| what does the pupil do | allow the light into the eye |
| what does the iris do | controls how much light get into the eye, controls the size of the pupil. |
| what does the lens do | refract light to focus it on the retina |
| what does the retina do | contains light receptors, which are sensitive to light |
| what does the optic nerve do | convert light signals into electrical impulses |
| what is the blind spot | back of the eye, a place on the retina with no photoreceptors |
| focussing on objects far away | lens thin, ciliary muscl relax and suspensory ligaments tighten |
| focussing on objects close | lens fatten, ciliiary muscle contracts and suspensory muscle slacks (loosen) |
| lots of light | pupils constrict, circular muscles contract and radial muscles relax |
| dim light | pupils dilate, circular muscles relax and radial muscles contract |