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The Optician Training Manual Test: 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 into the eye to allow images to pass through the image processing 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 two conditions that must be met in order for an image to be seen?
1: The image is brought to a point of focus (the lens of the eye or a camera is responsible for this)
2:The image is brought to focus on a surface capable of capturing the image in a form that is either saved (as on the film of a camera) or instantly processed (as the retina of the eye does).
What is the focal length of a lens with a power of +4.00?
4=1/d, 0.25 m or 25 cm.
What is the name of the structure in the eye that is capable of flexing in order to bring images into focus?
The 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?
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.
-3.00 -1.00 x 180
A visual acuity of 20/100 is how much worse than 20/20?
five times worse.
Do glasses ever magnify?
No
Name two types of lenses that have three separate powers: one for distance vision, one for intermediate vision, and one for near vision.
Trifocals and progressives