p3 eyes 0.0 / 5 ? PhysicseyesGCSEAQA Created by: AvaaaCreated on: 03-04-17 12:50 light is focused onto the... reitna of the eye by the lens and cornea 1 of 18 what does the lens have to contro focal length the lens has a variable focal length controlled by the cillirary musicles 2 of 18 What do we use to correct short sighted version? Short sighted eye is an eye that can only see near objects clearly. Corrected by CONCAVE LENS. 3 of 18 A concave lens is diverging lens 4 of 18 How do we correct long shorted vision long shorted vision is where the eye can only see distant objects. Corrected by CONVEX LENS. 5 of 18 THE higher the refractive index the thinner the flatter the lens is in the spectacles 6 of 18 How can we cure long sightedness shave more of cornea edges to make cornea more curved,,, more concave so the light refracts more and hits the back of the eye. 7 of 18 and short sightedness? shave cornea, so light refracts less 8 of 18 the pupil does.. pupil controls the intensity of the eye. 9 of 18 the lens... focuses on light, creates image which falls onto retina, 10 of 18 the iris controls the size of the pupil. 11 of 18 what is the lens connected to.. the lens chages shape to focus lights from objects at varying distances. Its connected to the ciliar musicles by the suspensory ligaments. 12 of 18 what does the ciliary muscles do they contract to change the shape of the lens. 13 of 18 when relaxed... the suspensory ligaments pulll the lens into a thinner flatter shape. 14 of 18 when contractted... tension is released so the ens takes on a more spehrical fat shape. 15 of 18 As the eye focuses on closer objects... its power increases, the lens changes shape and the foca length decreases. BUT distance between lens and image stays the same. 16 of 18 CCD in a camera is equivalent to what in the eye> the retina. 17 of 18 variable opening where light enters is .. the pupil and the aperture in the camera. 18 of 18
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