1) What strength is a lens measured in? a) microns b) add powers c) diopters d) prisms 2) What will light rays passing through a "plus" lens always do? a) diverge b) converge c) cohere d) disperse 3) What is the principal action on light passing from one medium into another of different density called? a) displacement b) convergence c) diffraction d) refraction 4) What range of UV light is typically responsible for sunburns? a) 10-100 nanometers b) 320-400 nanometers c) 100-290 nanometers d) 290-320 nanometers 5) What is the measure of how far it takes a lens to bring light to a point? a) focal length b) major axis c) power d) base curve 6) What is the spacing between the surface of the eye and the inside surface of a corrective lens known as? a) sagittal depth b) fitting cross c) seg drop d) vertex distance 7) What element of an eyeglass prescription is a measure of a patients myopia or hyperopia? a) cylinder  b) axis c) sphere d) add power 8) What are two modern forms in which prescription may be written? a) plus cylinder and minus cylinder b) cross cylinder and plus cylinder c) spherical and aspherical d) base curve and cross curve 9) A prescription -0.25, OS Plano, add +1.75 is primarily indicating what type of refractive error?  a) hyperopia b) presbyopia c) stigmatism d) nystagmus 10) A prescription for a patient with astigmatism will contain which of the following elements?  a) cylinder and sphere b) axis and add power c) cylinder and axis d) cylinder and prism 11) A prescription of OD of +1.00 -0.50 X 31 OS +1.75 -1.25 X 168 is an example of what kind of prescription? a) spherocyclindrical b) myopic c) aspheric d) anisometropic 12) A prescription is written as follows: OD -1.25 +1.75 X 110. What transposed prescription would be written on the lab order? a) -3.00 -1.75 X 10 b) +0.50 -1.75 X 110 c) Plano +1.75 X 30 d) +0.50 -1.75 X 20 13) If a patient insists on glasses for "near vision only," which would be the correctly transposed numbers to order the following OU prescription: -0.75 +2.50 X 11 add +1.25 a) +1.75 -2.50 X 101 b) +3.00 -2.50 X 101 c) +0.50 +2.50 X 101 d) +3.00 +2.50 X 11 14) One of the early solutions for extreme hyperopia was a type of lens with a very steep curvature in a small central portion, surrounded by a flat carrier edge. This was known as what type of lens? a) Myodisc b) Meniscus  c) Lenticular d) Corrective-curve 15) What is a lens with a singular curvature on the front, and two curvatures on the back called? a) cylindrical  b) aphakic  c) aspheric  d) toric 16) What is the power of a corrective lens referred to as when calculated purely from its measurable curvature? a) effective power b) surface power c) vertex power d) corrected power  17) What is the average refractive index of a poly-carbonate lens? a) 1.56 b) 1.60 c) 1.58 d) 1.67 18) What is the measurement of optical clarity of a lens called? a) reflectance  b) transmittance  c) Snellen Equivalent  d) Abbe value 19) What is the spherical equivalent of the following prescription: -2.25 +3.50 X 171 a) -0.50 b) -2.25 c) +0.50 d) +1.25 20) Given the prescription +1.00 -2.00 X 135, what is the effective power in the 90th meridian?  a) -1.00 b) -3.00 c) Plano d) +1.00 21) A prescription of +1.75 -2.75 X 153 would be written in what way by an ophthalmologist? a) +4.50 +2.75 X 63 b) -1.00 +2.75 X 63 c) -1.00 +2.75 X 153 d) -2.75 +1.75 X 153 22) A +4.00 lens intended to be positioned at PD of 30 mm was actually manufactured at 33 mm. What is the amount of prism induced by this error? a) 12 diopters b) 0.75 diopters c) 1.33 diopters d) 1.2 diopters  23) Vertical imbalance error is always read at the __________ lens in the 90th meridian.  a) more minus b) more plus c) weaker d) stronger 24) What is the dioptric power of a lens with a focal length of 400 mm? a) +2.50 b) -2.50 c) +4.00 d) +0.25 25) A patient is refracted at 13 mm with a prescription of +12.00 OU, but it is found that the frame she selected will hold the lenses at a distance of 18 mm from her eyes. What prescription should the optician order to compensate for this discrepancy?  a) +12.77 b) +13.25 c) +10.77 d) +11.23

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