ABO EXAM PRE-TEST – Flashcards
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When ordering a six inch temple, its corresponding millimeter value is which of the following? A. 135 mm B. 140 mm C. 145 mm D. 150 mm
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150 mm
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What is the focal length of a 2 diopter lens? A. 500 cm B. 39.37 inches C. 500 mm D. 2 meters
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500 mm
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Wavelengths are measured in A. Meters B. Decimeters C. Centimeters D. Nanometers
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Nanometers
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Which of the following has the shortest and therefore most harmful wavelength? A. UVC B. UVB C. UVA D. INFRARED
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UVC
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When two light wavesw are in "in phase" they will A. Destroy on another B. Reduce each front by half C. Compound one another D. None of the above
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Compound one another
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The cylinder axis tolerance for a 1.00D cylinder according to ANSI Z80.1 is A. Plus or minus 7 degrees B. Plus or minus 5 degrees C. Plus or minus 3 degrees D. Plus or minus 2 degrees
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Plus or minus 3 degrees
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A plus lens decentered "out" will result in a finished lens which is A. Balanced B. Thicker temporally C. Thicker nasally D. Uniform in edge thickness
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Thicker temporally
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A minus lens decentered "out" will result in a finished lens which is A. Balanced B. Thicker temporally C. Thicker nasally D. Uniform in edge thickness
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Thicker nasally
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An uncoated normal plastic lens will reflect approximately ______% of light. A. 2% B. 4% C. 8% D. 12%
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8%
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A lens having a minus curve on both front and back is called A. Toric B. Meniscus C. Biconvex D. Biconcave
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Biconcave
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Give the RX +1.00 +1.00 x 45, how much of the +1.00 cylinder is in the effect at axis 90? A. 100% B. 70% C. 50% D. 0
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50%
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80 degrees from the specified axis, a cylinder will show A. 5% of its power B. 10% of its power C. 50% of its power D. 97% of its power
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97% if its power
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The type of patient often bothered by large magnified eye look is a A. Myope B. Persbyope C. Hyperope D. Emmetrope
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Hyperope
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A Box O graph is used to measure lenses for A. Axis B. Power C. Thickness D. Size
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Size
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A presbyopic electrician that works on overhead wiring would benefit most from A. Executive bifocal B. Near only readers C. Double D D. Round Segment
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Double D
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A presbyopic golfer, when addressing the ball, is troubled by the placement of this normal bifocal. Which of the following would pose the best solution as a recreational golf glasses? A. Executive bifocal fit 1mm lower than standard B. Double D C. Quadrifocal D. Round segment rotated to the temporal side of the lens
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Round segment rotated to the temporal side of the lens
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Which of the following is NOT one of the 6 muscles responsible for the movement of the eye? A. Superior Rectus B. Inferior Rectus C. Internal Rotator D. Inferior Oblique
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Internal Rotator
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The index of refraction of spectacle crown glass is A. 1.49 B. 1.523 C. 1.53 D. 1.59
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1.523
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Whch of the following glass lenses is a fused bifocal? A. Executive B. Progressive C. Straight Top D. Ultex
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Straight Top
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The P.D. written on the order is mistakenly noted as 70mm, when the actual measurement should be 66mm. What unwanted prism would be found if the distance prescription is O.U. +5.00 shpere. A. 1 diapter base out/each eye B. 1 diapter base in/each eye C. 2 diapters out/each eye D. 2 diapters in/each eye
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1 diapter base out/each eye
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If the RX is +2.00 -4.00 x45, it would be necessary to decenter the lens ______ to create 1 diapter of base out prism. A. 2mm B. 4mm C. 6mm D. Not possible
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Not possible
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The element in photogray lenses that is responsible for the lightening and darkening reaction is A. Silver nitrade B. Ferrous oxide C. Silver halide D. Flint
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Silver halide
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Which of the following would provide the greatest benefit to a night driver? A. Polaroid B. Blue Blocker C. Anti-reflective coating D. Polycarbonate
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Anti-reflective coating
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A minus lens moved downward from the primary position will result in A. Base up prismatic effect B. Base down prismatic effect C. Base in prismatic effect D. Base out prismatic effect
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Base up prismatic effect
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A patient refracted at 15mm is prescribed a -10.00 shpere. The dispenser finds that the actual fitting distance will be at 10mm. What should the compensated lens power be? A. -9.50 B. -9.75 C. -10.75 D. -10.50
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-9.50
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A lens which reads +3.00 -2.00 x180 is decentered in 6mm too much. How much horizontal prism is created by this error. A. 1.8 diapters base in B. 1.8 diapters base out C. .6 diapters base in D. .6 diapters base out
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1.8 diapters base in
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If a pair of lenses are gound with diapters of base in prism in each lens, the patient will experience A. 4 diapters of prism base in B. 2 diapters of prism base out C. No prism D. None of the above
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4 diapters of prism base in
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Given a lens with a focal length of 1000mm / determine the power of the lens. A. One diapter B. Five diapters C. Ten diapters D. One hundred diapters
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One diapter
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Which wavelengths of light have been indicated as contributors to the onset of cataracts? A. 700-800 nm B. 400-550 nm C. 300-380 nm D. 100 - and below nm
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300-380mm
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The refractive astigmatism indicated by the RX +1.50 -1.00 x 180 is A. Compound Hyperopic B. Mixed C. Simple Myopic D. Antimetropic
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Compound Hyperopic
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The refractive astigmatism indicated by the RX +1.50 -1.75 x 35 is A. Compound Hyperopic B. Mixed C. Simple Myopic D. Antimetropic
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Mixed
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The patient's RX is -1.75 -.50 x 120 with a +2.00 add standard trifocal. What is the power through the intermediate. A. -1.25 -.50 x 120 B. -.75 -.50 x 120 C. -.75 -.50 x 30 D. -1.00 -.50 x 150
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-.75 -.50 x 120
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The Geneva lens measure is designed to measure A. Path length B. Refractive efficiency C. Focal length D. Lens Curvature
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Lens Curvature
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The focal length of a +5.00 Diapter lens is A. 20 cm B. 50 cm C. 39.37 inches D. 2 meters
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20 cm
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The problem of prismatic imbalance at the reading level is called A. Antimetropia B. Anisometropia C. Anisekonia D. Emmetropia
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Anisometropia
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Which of the following indicates the most acute distance vision? A. 20/20 B. 20/15 C. 20/30 D. 20/25
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20/15
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Which of the following is not a potential correction for vertical balance? A. Slab off B. Near only readers C. Reverse slab off D. Vertex compensation
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Vertex Compensation
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The ability of the eye to focus objects at varying distances is know as A. Presbyopia B. Objectivity C. Accommodation D. Refraction
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Accommodation
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Anisekonia is due to A. Prismatic inbalance at the reading level B. Myopia C. Keratoconus D. Unequal size retinal images
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Unequal size retinal images
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The corner of the eye where the upper and lower lids meet is the A. Iris B. Limbus C. Canthus D. Chiasm
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Canthus
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A ptosis crutch is used to correct A. Prism imbalance B. Drooping lid C. Phoria D. Scotoma
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Drooping lid
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In neutralizing a lens of unknown power your first reading is +1.00 and the next reading that focuses the cylinder target is -0.25. What is the RX? A. +1.00 -0.25 B. -0.25 +2.00 C. +1.00 -1.25 D. +0.25 +2.25
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+1.00 -1.25
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A +2.00 diopter lens decentered in 5mm beyond the patients measured pd will create A. 1 diapter base out prism B. 2 diapters base out prism C. 1 diapter base in prism D. 2 diapters base in prism
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1 diapter base in prism
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Which of the following conditions is indicated by the following RX: RX +1.00 -1.00 x180 -2.00 -0.50 x45 A. Antimetropia B. Diplopia C. Hypertropia D. Isophoria
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Antimetropia
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The loss of vision without any apparent defect to the eye is called A. Anisometropia B. Presbyopia C. Amblyopia D. Nystagmus
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Amblyopia
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The ANSI cylinder tolerance for a -0.25 cylinder is A. Plus or minus 2 degrees B. Plus or minus 3 degrees C. Plus or minus 5 degrees D. Plus or minus 7 degrees
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Plus or minus 7 degrees
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Which of the following has no power in the 180 degree median? A. +2.00 -2.00 x90 B. +2.00 +2.00 x180 C. +1.00 +1.00 x135 D. +1.00 -2.00 x45
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+2.00 -2.00 x90
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All specifications being equal which of the following materials will yield the thinnest lens? A. CR-39 B. Photogray C. Polycarbonate D. Crown
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Polycarbonate
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If the right temple is angled up the effect on the frame will be to A. Lower the right side B. Raise the right side C. Loosen the right temple D. Push the front away from the eye
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Lower the right side
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If the adjustable pads on a metal frame are repositioned downwards into the bridge of the frame the resulting effect on the fit will be to A. Lower the front B. Increase the pantosocopic angle C. Raise the front D. Decrease the retroscopic angle
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Raise the front
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Which Recreational activity would be best suited with yellow lenses? A. Fishing B. Hunting C. Racquetball D. Basketball
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Hunting
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Bicentric grinding is a term synonymous with A. Surfacing B. Multifocals C. Slab off D. Progressives
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Slab off
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If a patient is wearing a +12.00 diopter sphere and the adjustment is made to move them closer to the eyes, what effect will that have on the effective power of the lens? A. Decrease the plus power B. Increase the plus power C. Cause base in prism D. Cause base out prism
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Decrease the plus power
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Which RX of the following is the same as the following RX: -3.00 +2.50 x25 A. -3.00 +2.50 x105 B. -0.50 -2.50 x115 C. +0.50 +2.50 x115 D. +3.00 -0.50 x105
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-0.50 -2.50 x115
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Given a material of unknown index and the speed of light within that material as 101,000 miles per second. Compute the index of refraction for that material. A. 1.53 B. 1.62 C. 1.75 D. 1.84
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1.62
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Which of the following materials would make the safest lens in all circumstances? A. CR-39 B. Flint Glass C. Crown D. Polycarbonate
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Polycarbonate
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This agency is primarily concerned with safety in the workplace? A. FDA B. ANSI C. FTC D..OSHA
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OSHA
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Which of the following RX lenses should never be put in a Z87 Frame? A. 2mm dress lenses B. 3mm non-trademarked lenses C. 3mm tinted/non-trademarked as special purpose lenses D. None of the Above
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None of the Above
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If your lensometer reads +0.25 with no lens, a lens that measures -3.00 -1.50 x180 is actually A. -2.75 -1.25 x180 B. -2.75 -1.50 x180 C. -3.25 -1.75 x180 D. -3.25 -1.50 x180
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-3.25 -1.50 x180
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When verifying an add on on a 1 piece bifocal with a lens clock, a +2.00 add would clock ____ in the distance and ______ in the segment. A. +6.12/+8.12 B. +4.50/-7.25 C. +4.37/+7.12 D. +3.75/+1.00
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+6.12/+8.12
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What should you do when a consumer comes in and complains of severe eye pain? A. Take a complete history B. Check the eye with an ophthalmoscope C. Refer them back to the eye doctor D. Check the pupillary response to light.
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Refer them back to the eye doctor
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The radius of curvature of a six diapter surface is A. 265mm B. 176mm C. 132.5mm D. 88.3mm
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88.3mm
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The effect to the patient of 2 diapters of base up prism in each eye is A. 4 diopters of base down B. 4 diopters of base up C. No perceived prism D. None of the above
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No perceived prism
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A condition that describes an inflammation of the eyelid margins is A. Exophoria B. Esophoria C. Blepharitis D. Strabismus
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Blepharitis
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A reverse slab off should be applied to the lens with the most A. Power B. Plus C. Minus D. Thickness
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Plus
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Which of the following is not generally a factor in determining vertical imbalance? A. Reading depth B. Sphere power in the 90 degree meridan C. Cylinder power in the 90 degree meridan D. Add power
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Sphere power in the 90 degree meridian
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The best absorber of infrared radiation is a A. Polycarbonate lens B. Green Glass lens C. CR-39 lens D. Grey 3 Plastic lens
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Green Glass lens
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The spherical equivalent of the lens +1.00 -3.00 x90 is A. +0.50 B. -0.50 C. +1.25 D. -1.25
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-0.50
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A +3.00 lens has the following prismatic effect at 10 mm below the distance optical center: A. 3 diapters base up B. 3 diapters base down C. 1.5 diapters base in D. 1.5 diapters base out
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3 diapters base up
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If the pad arms are shortened (pushed into the frame) this adjustment will A. Raise the front B. Drop the front C. Set the front closer to the face D. Push the front more out
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Set the front closer to the face
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If the eyewires are too far from the cheeks the adjustment to take care of this condition would be to A. Spread the pads apart B. Bend the pad arms up C. Increase the pantoscopic tilt D. Decrease the pantoscopic tilt
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Increase the pantoscopic tilt
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Which of the frame materials is an epoxy resin that is recommended by its manufacturer to be edged with an A box measurement of 5mm over its marked eye size? A. Cellulose Acetate B. Carbon Fiber C. Optyl D. Propionate
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Optyl
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A ptosis crutch is used to give support to the A. Nasal Bridge B. Nose Pads C. Lower Lids D. Upper lid
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Upper Lid
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Aspheric lens surfaces are most helpful when used with which of the following: A. Low powered lenses B. Occluder lenses C. Cataract lenses D. Sunglass lenses
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Cataract lenses
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A lens that is cresent shaped with one of the sides measuring a six diopter radius is known as a : A. Periscopic Lens B. Bent Lens C. Meniscus Lens D. None of the Above
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Meniscus lens
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Which of the following instruments could be used to verify slab off? A. Polazriscope B. Disometer C. Puillometer D. Lensometer
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Lensometer
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An RX with right minus and left plus is a: A. Emmetropic B. Antimetropic C. Hetermetropic D. Isometropic
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Antimetropic
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Which of the following is not a type of astigmatism. A. Compound emmetropic B. Simple hyperopic C. Compound myopic D. Simple myopic
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Compound emmetropic
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Overall frame measurements are stated in A. Millimeters B. Centimeters C. Decimeters D. Meters
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Millimeters
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The patient is looking 10 mm below the distance optical center. What is the prismatic effect to the patient from the distance RX at that level? A. 1.00 diapter base up B. 1.00 diapter base down C. 2.00 diapter base up D. 2.00 diapter base down
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1.00 Diapter base down
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If the RX is OS +1.00 +3.00 x45, what would be the total power at axis power 90? A. +1.00 B. +2.00 C. +2.25 D. +2.50
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+2.50
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A patient complains that the floor seems to be concave, is possible experiencing excessive A. Base In Prism B. Base Out Prism C. Base Down Prism D. Base Up Prism
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Base Down Prism
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What would the reading RX be if the following distance RX and bifocal addition are given: A. +.50 -.25 x90 B. +1.75 -.25 x90 C. +2.75 -.25 x90 D. +1.25 -.25 x90
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+1.75 -.25 x90
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Corrected curve lenses have A. Less Divergence B. More Plus Power C. Less Plus Power D. Less Oblique Astigmatism
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Less Oblique Astigmatism
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A patient that complains that the floor seems to be convex is possibly experiencing excessive A. Base In Prism B. Base Out Prism C. Base Down Prism D. Base Up Prism
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Base up prism
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A minimum center thickness for a minus industrial lens according to Z87 standards is A. 1.5 mm B. 2.0 mm C. 3.0 mm D. 3.5 mm
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3.0mm
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Which of the following bifocals would offer the widest reading range? A. Ultex B. D-35 C. Executive D. ST-40
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Executive
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The optician has just neutralized an unknow power lens with test lenses. The test lens used to neutralize the power in the vertical is a plus 2.0 and the test lens used to neutralize the power in the horizontal is a plus 3.00. What is the RX? -2.00 +0.50 x180 -2.00 -1.00 x 90 -1.50 -0.50 x 180 +1.00 +0.50 x180
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-2.00 -1.00 x90
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The term diplopia refers to: A. A double segmented lens B. Double Vision C. A lens with two ploplas D. None of the above
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Double Vision
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The optical cross is a graphic representation used to diagram: A. Base curve B. Compensated vertex C. Total lens power D. Corrected curves
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Total Lens Power
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Determine imbalance at the reading level in the following prescription (10mm reading depth) OD: -4.00 -2.00 x90 OS: -1.00 -3.00 x180 A. 4 diapters B. 2 diapters C. 1 diapter D. No imbalance
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1 diapter
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The refractive index to which optical tools and gauges are calibrated is A. 1.49 B. 1.523 C. 1.53 D. 1.56
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1.53
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A minus 5 diapter lens decentered in 2mm beyond what is called for to achieve the correct PD creates: A. 1 diapter of base in prism B. 1 diapter of base out prism C. 2 diapters of base in prism D. 2 diapters of base out prism
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1 diapter of base out prism
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Double D lenses are an advantage for presbyobes that: A. Are at least 60 years old B Work over their heads C. Golf D. Are an advanced presbyope
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Work over their heads
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The focal length of a +2.00 diapter lens is A. 200cm B. 25cm C. 100cm D. 50 cm
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50 cm
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Increasing the diameter of a lens always increases its A. Vertex Power B. Thickness C. Add Power D. Radius of Curvature
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Thickness
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In the boxing system the A measurement represents: A. Lens depth B. Lens width C. Diameter D. Sag Value
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Lens width
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A 10.00 diapter surface measured with a lens clock has a radius of curvature equaling; A. 60mm B. 98.6mm C. 53mm D. 88.3mm
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53mm
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An uncut lens must be at least ____mm in diameter to allow the cutting of a 52mm round lens decentered 4mm in: A. 62 B. 60 C. 58 D. 56
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60
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A -3.00 powered lens has a base curve of +4.25. What is the ocular curve? A. +3.00 B. -4.25 C. -3.00 D. -7.25
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100
