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The Optician Training Manual: Chapter 1

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What is the purpose of the cornea?
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Terms in this set (12)
What is the purpose of the cornea?
The cornea provides a clear window in the eye to allow images to pass through to the image processing the tissue, the retina.
What is the purpose of the optic nerve?
The optic nerve is the information superhighway of the eye. it transmits the information the retina collects and sends it to the brain for processing.
What are the 2 conditions that must be met in order for an image to be seen?
The image must brought to a point of focus (the lens of the eye or a camera is responsible for this,) & the image must be brought to focus on a surface capable of caturing the image in a form that is either saved ( such as the film of the camera or instantly processed ( such as the retina of the eye).
What is the focal length of a lens with a power of +4.00?
The focal length is found using the equation F=1/d. Where F is the power of the lens & d is the focal length in meters. Therefore 4=1/d. Solve for d & you have .25 meters or 25cm.
Name 2 types of lenses that have 3 separate powers: one for distance vision, one for intermediate vision, & one for near vision.
Trifocals & progressives both have focal points & one for near vision.
What is the name of the structure in the eye that is capable of flexing in order to bring images into focus?
Lens
Ghosting is a common symptom of what refractive error?
Astigmatism
If a person complains of blurriness when looking at the television but sees well when reading, the most likely diagnosis would be what?
Nearsighted( myopia)
What power lens (+ or -) does someone who is hyperopic require?
Plus power lens
Convert the prescription +4.00 +1.00 x 090 into minus cylinder form.
1) Add the sphere & cylinder together to get the new sphere.
2) change the sign of the cylinder
3) The axis is 90 degrees away from the original axis.
-3.00 x -1.00 x 180.
A visual acuity of 20/100 is how much worse than 20/20 ?
5 times worse. A 100 size letter is 4 times larger than a 20 size letter.
Do glasses ever magnify?
No.