To identify the key parts of the eye and how they work

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Presentation transcript:

To identify the key parts of the eye and how they work Homework: To be able to label the parts of the eye and state what each does

What is perception - video Listening & discussion – see how the eye is set up – biology Listening and discussion – the role of the retina Make & create – Label your own eye diagram Written task – what the function of each part of the eye is Homework – create your own eye poster for your revision folders

TO IDENTFY THE KEY PARTS OF THE EYE AND HOW THEY WORK http://www.youtube.com/watch?v=unWnZvXJH2o PERCEPTION VISION Threshold of sensation Psychological state Stimuli

The eye with good alignment is your dominant eye! Use both eyes…at arm’s length, center target within finger OK sign Lock hand in position…see which eye is still aligned by closing the other The eye with good alignment is your dominant eye! http://www.twohotpotatoes.com/wp-content/uploads/whose-plate-4-tips-table-manner-03-af.jpg

Copyright Norton Presentation Manager HUMAN Vs INSECT VISION Copyright Norton Presentation Manager

It makes you wonder what exactly they see! SPIDERS HAVE UP TO 8 EYES LOOKING IN DIFFERENT DIRECTIONS!! It makes you wonder what exactly they see! http://farm5.static.flickr.com/4010/4682587135_b91e399914.jpg

Copyright Norton Presentation Manager VERTEBRATE EYE senses image Copyright Norton Presentation Manager focuses image Blind Spot What? controls light sends image to brain

BLIND SPOT CD341274.jpg 9

Figure 46-8 10 The structure of the vertebrate eye. In the retina, cells are arranged in layers. Pigmented epithelium Ganglion cells Connecting neurons Photoreceptor cells Sclera Retina Iris Direction of light Pupil Cornea Fovea Lens Optic nerve (to brain) Axons to optic nerve 10

Retina (photoreceptors are on the inside surface) Figure 46-9 Retina (photoreceptors are on the inside surface) Cornea Lens Sensory nerves to brain 11

Vertebrate Retina rod cone light

Rods and cones contain stacks of membranes. Figure 46-10 Rods and cones contain stacks of membranes. 0.5 µm Cone Rod Opin 13

Use both eyes, stare at area shown in blue for 15 seconds or so

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Use both eyes, stare at the parrot’s eye for 15 seconds or so

What color is the bird in the cage? Blink if needed

Use both eyes, stare at the parrot’s eye for 15 seconds or so

What color is the bird in the cage? Blink if needed

Use both eyes, stare at the parrot’s eye for 20 seconds or so

What color is the bird in the cage? This color is a bit harder to visualize

Use both eyes, stare at the white dot for 20 seconds or so

What colour is this dress?

To identify the key parts of the eye and how they work… http://www.youtube.com/watch?v=- 7RD4E1p3vc&list=UU0sncyf0KJ1lB-sLECNou9A http://www.ted.com/talks/beau_lotto_optical_illusions_show_h ow_we_see?language=en (16.5 minutes)