Compléter Unit 3. Human interaction and health II. The sense of sight.Version en ligne We are going to review what have we learnt about the sight, its elements and its functions. par Daniel de la Cruz Manjón Pozas 1 pupil front iris amount expands centre Light contracts ? The is at the of the eyeball . enters the eye through the , a small hole in the of the iris . The pupil and depending on the of light it receives . 2 shape focus lens iris ? Behind the , there is a flexible . The lens changes to the image . 3 receptor eyeball optic retina stimulus signals brain ? The , at the back of the , contains the cells . They capture the and send along the nerve to the .
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