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ABO/NAO 4: Questions And Accurate Answers (100%)
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ABO/NAO 4: Questions And Accurate Answers (100%)
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ABO/NAO 4: Questions And Accurate Answers (100%)The tools, (lens clocks) laps and gauges(generator calibrations) used in
surfacing lenses are calibrated for what glass of index Right Ans - 1.53
What is the focal length for 10D lens Right Ans - 1 over 10 = .1m
The optical center of a round segment is located ___? Right Ans - at the
geometric center of the segment
In a nearsighted eye incident parallel rays of light form an image where?
Right Ans - anterior to the retina / in front of the retina
What is spherical aberration Right Ans - an optical defect caused by
peripheral and paraxial rays focusing at different points along the optical axis
of lens.
In a convergent lens, an object point located at infinity will be focused at
which focal point? Right Ans - the secondary focal point / this is the point
where parallel rays of light are brought into focus
What determines the focal length of a thick lens? Right Ans - curvature of
its refracting surfaces, the thickness of the lens and its index of refraction
What does LTB stand for? Right Ans - length to bend/ temple length
measured from the center of the hinge barrel to the middle of the bend
What is the skull temple style? Right Ans - the temple that bends at the top
of the ear and follows the contour of the skull, resting evenly against the skull
If a child's bridge is extremely flat and perfect weight distribution cannot be
gained by adjusting the pad arms, the dispenser should increase the _______of
the frame slightly Right Ans - retroscopic angle
ANSI standards define the "cylinder" as that principal meridian which....
Right Ans - contains the spherical power component of a sphero-cylinder lens
When fitting a PAL (progressive addition lens) for a child, where should the
fitting cross height be Right Ans - 4 mm above the pupil
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