2.86 describe the structure and function of the eye as a receptor
- The eyes are moved by 3 pairs of eye muscles.
- Light enters the eye through the transparent cornea and passes through the pupil (the pupil is surrounded by the coloured iris). The conjunctiva, a delicate, transparent layer at the front of the cornea is kept moist by tear glands.
- Light enters the eye through the transparent cornea and passes through the pupil (the pupil is surrounded by the coloured iris). The conjunctiva, a delicate, transparent layer at the front of the cornea is kept moist by tear glands.
Cornea - It is a curved band of strong, clear tissue that is on the surface of the eye. The cornea focuses the light onto the retina.
Epithelium - Provides a thin protective layer from the cornea and heals quickly when disturbed.
Iris - A muscle that controls the size of the pupil. The coloured part of the eye.
Pupil - The black circular area in the middle of the eye that controls the amount of light reaching the retina.
Retina - This is a membrane on the inner wall of the eye. It is similar to the film in a camera - it changes light into images that are transferred to the brain via the optic nerve. It is an inner light-sensitive layer that contains rod cells that work in dim light and cone cells that detect colour and details.
Sclera - Provides protection and is the outer white coat of the eye.
Lens - This is a natural lens behind the pupil that changes shape to allow the eye to focus. It focuses light onto the retina. When aging, the natural lens hardens and results in the loss of reading vision.
Choroid - A black layer containing lots of blood vessels
Vitreous humour - Transparent jelly-like substance that supports the back of the eye
Yellow Spot / Fovea - most sensitive part of the retina
Blind Spot - where the optic nerve attaches to the eye and there are no light-sensitive cells here
Optic Nerve - Carries nerve impulses away to the brain
Suspensory ligaments - holds the lens in place
Aqueous humour - Watery liquid filling the front of the eye
Ciliary muscle - changes the thickness of the lens when it is focusing
Epithelium - Provides a thin protective layer from the cornea and heals quickly when disturbed.
Iris - A muscle that controls the size of the pupil. The coloured part of the eye.
Pupil - The black circular area in the middle of the eye that controls the amount of light reaching the retina.
Retina - This is a membrane on the inner wall of the eye. It is similar to the film in a camera - it changes light into images that are transferred to the brain via the optic nerve. It is an inner light-sensitive layer that contains rod cells that work in dim light and cone cells that detect colour and details.
Sclera - Provides protection and is the outer white coat of the eye.
Lens - This is a natural lens behind the pupil that changes shape to allow the eye to focus. It focuses light onto the retina. When aging, the natural lens hardens and results in the loss of reading vision.
Choroid - A black layer containing lots of blood vessels
Vitreous humour - Transparent jelly-like substance that supports the back of the eye
Yellow Spot / Fovea - most sensitive part of the retina
Blind Spot - where the optic nerve attaches to the eye and there are no light-sensitive cells here
Optic Nerve - Carries nerve impulses away to the brain
Suspensory ligaments - holds the lens in place
Aqueous humour - Watery liquid filling the front of the eye
Ciliary muscle - changes the thickness of the lens when it is focusing
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