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28 Cards in this Set
- Front
- Back
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What happens to the wave frequency length between radio waves and gamma rays |
The frequency gets shorter as it gets further along what does the lens do |
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What is on the electromagnetic spectrum |
Radio waves Microwaves Infrared Visible light Ultraviolet Xrays Gamma rays |
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What does the lens do |
Focus light onto retina |
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What does the cornea do |
Protects the front of the eye |
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What does the iris do |
Changes the size of the pupil |
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Pupil |
Allows light to enter the eye |
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What does the outer coat do |
Protects most of the eye |
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What does the jelly do |
Gives the eyeball it’s shape |
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What does the optic nerve do |
Carries electrical impulses to the brain |
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Retina |
Changes light energy into electrical impulses |
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What does the blind spot do |
Where the optic nerve leaves the eye |
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What is refraction |
When light mover from one material to another it changes direction so long as it enters at an angle to the normal |
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What do convex lenses do |
Bring the lens to a focus |
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What does a concave lens do |
Separate lenses out more |
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What is long sight |
Long sight is where the lens focuses to a point after the blind point |
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What is short sight |
Where the lens focuses before the blind spot |
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What is endoscopy |
A simple procedure that allows doctors to look inside the patient easily |
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What is an endoscope made up of |
It is made up of 2 bundles of optical fibres |
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What are the 2 optical fibre bundles |
The first bundle carries light down to the tip the other carries an image back up to the computer screen |
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How does light travel down the endoscope |
It totally internally reflects |
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What type of light source is the endoscope and why |
Cold light source as the glass doesn’t conduct heat |
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What does Infared do |
To produce thermograms and treat muscle injuries |
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What can a thermogram do |
Detect tumors |
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What are the 2 highest energy wave |
Xrays and gamma waves |
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What is s ct scan |
A ct scan uses xrays to build up a 3D image of the body |
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What do we refer to gamma rays as |
Ionising radiation |
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What is the only energy that can travel through the body |
Gamma rays |
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What can gamma rays be used to do |
Kill cancerous cells and trace blood flow through the body |
