Completar Frases Unit 3. Human interaction and health II. The sense of sight.Versión en línea We are going to review what have we learnt about the sight, its elements and its functions. por Daniel de la Cruz Manjón Pozas 1 expands amount iris contracts Light centre pupil front ? 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 focus iris shape lens ? Behind the , there is a flexible . The lens changes to the image . 3 optic receptor brain stimulus retina eyeball signals ? The , at the back of the , contains the cells . They capture the and send along the nerve to the .
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