The Optician Training Manual Test: Chapter 1 Rated 100% Correct!!

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.