Powerpoint eyes

1. SENSE ORGANS G roups of receptor cells responding to specific stimuli: light , sound, touch , temperature and chemicals .

2. THE EYE

3. Structure and function

4. PUPIL REFLEX

5. ACCOMODATION Is the process of producing a finely focused image on the retina. It is carried out by the action of the ciliary muscles on the lens .

6. ACCOMODATION

7. Photoreceptors : Rods and cones in the retina Type of light detected Distribution in the retina RODS Dim light, low light intensity ( black and white vision .) More concentrated on margins , less tightly packed ( less detailed image ) CONES Bright light, high light intensity ( colour vision ) Fovea ( yellow spot) packed tightly together . ( sharp image )