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The Eye

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by

Paul Sheffield

on 19 October 2016

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Transcript of The Eye

The Eye
L.O
Simple structure
Function of the eye

Starter
Collective memory
you will need to pick one artist
you will each have two 1 minute chances to view the diagram
Pupil/Iris reflex
dissect the eye
B.2.1 Physics of the Eye
• Physics of vision
Simple structure of the eye.
The eye as an optical refracting system, including ray diagrams of image formation.
• Sensitivity of the eye
Spectral response as a photodetector.
• Spatial resolution
Explanation in terms of the behaviour of rods and cones.
• Persistence of vision
Excluding a physiological explanation.
What do the following words mean?
neurone
receptor
synapse
effector
motor
sensory
reflex
impulse
antagonistic
EYE dissection
BLIND SPOT
Radial
concentric
1-10mm
factor of 100
Optical illusions
https://faculty.washington.edu/chudler/chvision.html
Sensitivity of the eye
http://www.exploratorium.edu/learning_studio/cow_eye/step09.html
Medical Physics
L.O
The eye
Pupil reflex
Resolution
Accomodation
Lenses
Accommodation
Problems with sight
Myopia
Short sight
elongated eyball
thickened lens
see close
focus in front of the retina
Diverging concave
Hypermetropia
long sighted
shortened eyeball
lens too thin
see distant
focus behind the eyeball
Converging diverging
Resolution
Lens diagrams
Real image converging/convex lens
diminished if beyond 2F
Same size at 2F
Magnified between 2F and F
Conventions
Virtual Image convex/ converging lens
Diverging Lens
Magnification
V
U
Lens Formula
U = distance of the object from the lens
V= distance of the image from the lens
A real image is a positive value
A virtual image is a negative value
Convert the mm to m
The structure of the eye.

Correction of vision using convex and concave lenses to produce an image on the retina.



Range of vision. The eye can focus on objects between the near point and the far point.

Comparison between the structure of the eye and the camera.

Describe the function of parts of the eye: retina, lens, cornea, pupil/iris, ciliary muscle and suspensory ligaments.

Explain how the action of the ciliary muscle causes changes in the shape of the lens, which allows the light to be focused at varying distances.

Recall that the near point is approximately 25 cm and the far point is infinity.



Be aware that the film in a camera or the charge-coupled devices (CCDs) in a digital camera is the equivalent of the retina in the eye.

https://app.doublestruck.eu/index.php?s=AG_PH&k=e9c5205481dc8bc1291e93d5f29645e9&theme=EP&otheme=EP
Full transcript