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11. 2. Sight. The structure of our eye. eyeball. eye muscles. orbit ( 眼窩 ). eye muscles. skull. The structure of our eye. The front surface of the eye is protected by:. eyebrow ( 眼眉 ). prevents sweat from getting into the eye. The structure of our eye.
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11.2 Sight
The structure of our eye eyeball eye muscles orbit (眼窩) eye muscles skull
The structure of our eye The front surface of the eye is protected by: eyebrow (眼眉) prevents sweat from getting into the eye
The structure of our eye The front surface of the eye is protected by: eyelashes (眼睫毛) trap tiny objects and prevent them from getting into the eye
The structure of our eye The front surface of the eye is protected by: eyelid (眼瞼) can be closed to protect the eye from dirt and strong light
11.1 3D model Examining the human eye model Examine the structure of the eye model and label the diagram.
11.1 a b cornea sclera c d lens iris
11.1 e g pupil retina h optic nerve f jelly-like fluid
11.2 Experiment video Dissecting an ox eye 1 Examine the outer parts of the eye. ox eye Petri dish
11.2 2 Cut away the eyelid, fatty substance around the eyeball and eye muscles.
11.2 2 Press the sclera gently.
11.2 Is the sclera tough? Yes. 2
11.2 3 cut
11.2 3 front half back half
11.2 Identify the cornea, irisand pupil. 3 pupil cornea iris front half back half
11.2 a What is the colour of the cornea? Colourless/Transparent. pupil cornea iris front half
11.2 b What is the colour of the iris? Black. iris front half
11.2 What is the colour of the lens? Colourless/Transparent. 4 lens
11.2 Does the print change in size? How? Yes. It becomes bigger. 5 lens newspaper
11.2 6 Press gently.
11.2 How does the print change in size when compared to the print in step 5? It becomes smaller. 6
11.2 7 retina back half
11.2 8 optic nerve blind spot(盲點)
The structure of our eye Cornea Allows light to enter the eye.
The structure of our eye Cornea Its curved surface helps focus light onto the retina.
The structure of our eye Sclera A tough white coat; protects the eyeball.
The structure of our eye Iris Controls the size of the pupil.
The structure of our eye Pupil Allows light to enter the eye.
The structure of our eye Lens Helps focus light onto the retina.
The structure of our eye Jelly-like fluid Maintains the shape of the eyeball.
The structure of our eye Jelly-like fluid Helps focus light that enters the eye.
The structure of our eye Retina The image of an object is formed on it. It contains light-sensitive cells.
The structure of our eye Optic nerve Sends messages from light‑sensitive cells to the brain.
How is an image formed in the eye? retina 3D animation cornea optic nerve lens
How is an image formed in the eye? 1 Light from an object enters the eye.
How is an image formed in the eye? 2 The cornea, the lens and the jelly-like fluid focus the light onto the retina.
How is an image formed in the eye? 2 A sharp and inverted image is formed.
How is an image formed in the eye? 3 The light-sensitive cells on the retina are stimulated by light.
How is an image formed in the eye? They send messages to the brain along the optic nerve. 3 brain
How is an image formed in the eye? 4 The brain interprets the messages as an upright image.
How is an image formed in the eye? The process of how we see: light from an object cornea lens bends the light
How is an image formed in the eye? The process of how we see: lens retina bends the light which is then focused onto
How is an image formed in the eye? The process of how we see: retina light-sensitive cells (receptors) contains
How is an image formed in the eye? The process of how we see: light-sensitive cells (receptors) brain stimulated by the light and send messages to
How is an image formed in the eye? The process of how we see: brain upright image of the object interprets the messages as
Seeing objects at different distances focusing on the words near objects
Seeing objects at different distances focusing on the bird distant object
Seeing objects at different distances How can we see objects at different distances?
11.3 Experiment video Focusing with lenses of different thickness screen thin convex lens 1 light source
