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level: The eye

Questions and Answers List

level questions: The eye

QuestionAnswer
structure of the eye diagramhere
what does the cornea do?refract the light
what does the pupil doallow the light into the eye
what does the iris docontrols how much light get into the eye, controls the size of the pupil.
what does the lens dorefract light to focus it on the retina
what does the retina docontains light receptors, which are sensitive to light
what does the optic nerve doconvert light signals into electrical impulses
what is the blind spotback of the eye, a place on the retina with no photoreceptors
focussing on objects far awaylens thin, ciliary muscl relax and suspensory ligaments tighten
focussing on objects closelens fatten, ciliiary muscle contracts and suspensory muscle slacks (loosen)
lots of lightpupils constrict, circular muscles contract and radial muscles relax
dim lightpupils dilate, circular muscles relax and radial muscles contract