Optician's ABO Study Guide 2023 Latest Version
To widen the distance between the pads of a frame or mounting, bent the pad arms: - Outward/Angle the temples upward from the end pieces.
A reverse slab-off is molded with base _____ prism in the near portion of the lens. - Down
Multifocal height is usually determined by measuring from the: - Lower edge of the lens.
If the pad arms are lengthened, this adjustment will: - Push the front out more.
A semi-rimless mounting consists of: - A center piece with lens bars connecting the end pieces and temples.
An Rx with the O.D. minus and the O.S. plus is an obvious case of: - Antimetropia
Hilite lenses have a refractive index of: - 170
The most commonly used prescription for correcting muscle imbalance in exotropia
would be: - Base in prism.
A very good CR-39 lens commonly used in cataract case is a: - Lenticular
The near point for both a hyperope and myope is: - The front curve, thickness, vertex distance.
The prism measurement indicator found in a vertometer or lensometer is called the: - Reticle
An opthalmic correction from an ametrope is to focus parallel incident light rays at the: - Far point of the eye.
What base curve is recommended when grinding a single vision glass lens Rx is: +6.50- 2.00x165? - +10.00
Which formula accurately represents Prentice's Rule? - Prism=Distance (cm) x Dioptric Power/10
What type of visual error is indicated by the following Rx? Rx +2.00-100x90 - Compound hyperopic astigmatism
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A pupillometer is used to measure the: - Interpupillary distance
Astigmatism is corrected by the lens having: - Cylinder power
Which base curve would be the best selection for Rx O.U. +3.00+0.50x90? - +8.00D
What base curve would you believe good to use on the Rx: O.U. +3.00+0.50x90 - +8.00 base
Myopia is usually associated with: - A longer than normal eyeball
A slab-off should be ground in the lens which was the: - Most Minus Power
A reverse slab-off should be used in the eye which has the: - Most Plus Power
Image size is always increased if you: - Increase the front curve.
A ptosis crutch is used to give support to: - Upper lid
Rx O.D. -4.50-100x180 O.S. -2.50-100x45, This prescription indicates an obvious case
of: - Anisometropia
Aspheric lens surfaces are most commonly used with: - Cataract lenses
Which of the following occupations would be best suited with double segment lenses? - Electrician
What does one prism diopter deviate at? - A prism diopter deviates a ray of light 1cm at a distance of one meter.
Bifocals are used to correct for a condition called: - Presbyopia
Photochromic lenses will be darkest on which day? - Cold, bright day.
Lens calipers are commonly used to measure: - Lens thickness
If the eyewires touch the cheeks, the adjustment to take care of this condition would be:
- Decrease pantoscopic tilt.
If the right temple is angled down, this adjustment will: - Raise the right side of the front.
The instrument that opticians commonly use to measure vertex distance: - Distometer
Prism power is determined by the: - The amount lens turns light from its original course.
As the pantoscopic angle is increased: - The optical centers should be lowered.
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