Biology - eye 5.0 / 5 based on 2 ratings ? BiologyNervous system, hormones and behaviourGCSEAQA Created by: LunaShomeiRoseCreated on: 06-12-18 15:01 What type of receptor is the eye? Sensory receptor 1 of 38 The eye has receptors that are sensitive to... Light intensity and colour (light waves) 2 of 38 What is the sclera? Tough & supporting outer layer of eye 3 of 38 What does it do? (purpose) protects eye 4 of 38 What's the cornea? Transparent outer layer at front of eye 5 of 38 what's its purpose? Refracts/bends light into eye 6 of 38 What's the pupil? dark hole in middle, where light enters eye 7 of 38 What's the name of the coloured part of the eye? Iris 8 of 38 It contains muscles that d__ and c__ pupil (make wider and smaller) dilate and constrict 9 of 38 it controls... amount of light that enters eye 10 of 38 What does the lens do? Focuses light onto retina 11 of 38 It becomes fatter to focus on ____ objects (closer? further?) Closer 12 of 38 And becomes ___ to focus on objects further away Thinner 13 of 38 The suspensory ligament connects the ciliary muscle with the __ lens 14 of 38 It holds the __ in place lens 15 of 38 What do they do? Control shape of lens 16 of 38 What's the retina? Layer of receptor cells found at back of eye 17 of 38 They detect changes in ___ and convert it to ___ light. impulses 18 of 38 The optic nerve leads away from the eye. It carries ___ from the retina impulses 19 of 38 Why is it important to limit light that enters eye? it can damage the retina 20 of 38 Why is it important to let as much light in a possible when it's dark? so we can see 21 of 38 What controls how much light gets in eye? Muscles in iris 22 of 38 What happens to eye in bright conditions? circular muscles contract. Radial muscles relax. causing pupil to constrict to reduce light 23 of 38 Muscles work in pairs, when one contracts, the other relaxes. So what would the muscles do in dark conditions? Circular relax. Radial contract.causing pupil to dilate to increase light 24 of 38 What two parts of the eye are involves in focusing? Lens and cornea 25 of 38 Light rays are sent out to eye when you look at something. They enter the cornea and is re___ refracted 26 of 38 It's refracted further as it goes through the ___ so they meet at point on r__ (at back of eye) lens. retina 27 of 38 These rays have now been ___ to form an image focused 28 of 38 Accommodation is where a lens changes shape to... focus on a far/near object 29 of 38 When focuses on near object, the cillary muscles ___ and the suspensory ligaments ___ cillary contracts. suspensory ligaments loosen 30 of 38 This means the lens becomes __ and refracts light more strongly/weakly? thicker. more strongly 31 of 38 What does myopia and hyperopia mean? myopia = short-sighted. hyperopia = long-sighted 32 of 38 Why are some people long-sighted Eyeball is too short or cornea is too flat, meaning light is focused behind retina instead of onto it 33 of 38 ___ lens are used to bend light before they reach eye to focus on retina convex 34 of 38 Why are some people short-sighted? Eyeball is too long or cornea too curved so light is refracted too strongly so rays meet in front of retina, not on it 35 of 38 ___ len spread light out to focus on retina concave 36 of 38 Inproper use of contact lenses can risk... eye infection 37 of 38 Lazers can reshape the __ and change how it refracts light cornea 38 of 38
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