Ophthalmic Dispensing Review Exam | 85 Questions with correct Answers The optician has just neutralized an unknown power lens with test lenses. The lens
... [Show More] used to neutralize the power in the vertical meridian is a +1.00 and the test lens used to neutralize the power in the horizontal meridian is -1.50. (NOTE: These test lenses were used ALONE for each meridian, NOT superimposed.) What is the Rx? a. +1.00 +1.50 x 090 b. +1.00 +1.50 x 180 c. +1.00 +0.50 x 180 d. +1.00 +0.50 x 090 A pair of crossed cylinders, +1.00 x 090 and +1.50 x 180 would produce a power of: a. +1.00 +1.50 x 090 b. +1.00 +1.50 x 180 c. +1.00 +0.50 x 180 d. +1.00 +0.50 x 090 The vertical difference in power between lenses in the following Rx is: OD: -1.00 +0.50 x 045 OS: -1.00 +0.50 x 090 a. 0.75 D sph b. 0.50 D sph c. 0.25 D sph d. No difference The P.D. written on the order is mistakenly noted as 70 mm when the actual measurement should be 66 mm. What unwanted prism would be found in the prescription if the distance prescription is OU -15.00 D sphere? a. 3 prism BI each eye b. 2 prism BO each eye c. 2 prism BI each eye d. 2 prism BO each eye The patient is looking 5 mm below the distance optical center. What is the prismatic effect to the patient from the distance Rx at that level? Rx: Vx 12mm-FT 25 OD: +2.00 OS: +3.00 ADD: +2.00 OU a. 0.50 prism BI b. 0.5 prism BU c. 1.50 prism BU d. 1.50 prism BD The spherical equivalent of the lens +1.00 +2.50 x 090 is: a. +1.50 D b. +2.25 D c. +2.50 D d. +3.50 D If the prescription is OD +1.00 +2.50 x 045, what would be the total power at axis 90? a. +1.00 D b. +2.00 D c. +2.25 D d. +2.50 D What would the reading Rx be if the following distance Rx and bifocal addition are given? Rx +0.75 +0.25 x 090 ADD +2.00 a. +0.50 +0.25 x 090 b. -1.25 +0.25 x 090 c. +2.75 +0.25 x 090 d. +1.25 +0.25 x 090 A pupillometer is used to measure the: a. Diameter of the pupil b. Radius of the pupil c. Interpupillary distance d. Height of the pupil 20 feet is equivalent to: a. 2 meters b. 4 meters c. 6 meters d. 8 meters A +3.00 D lens has the following prismatic effect 8 mm below the optical center: a. 2.4 BU b. 2.4 BD c. 2.4 BO d. 2.4 BI If a +10D lens is moved 5 mm nearer the eye, it will be about: a. 25D stronger plus b. 25D weaker plus c. 50D stronger plus d. 50D weaker plus 60 degrees from the axis, a cylinder will contain: a. 75% of its power b. 60% of its power c. 66.6% of its power d. 30% of its power An Rx OD require 1 1/2 mm decentration out and a 2 mm segment inset. Total inset of the segment would be: a. 3 1/2 mm in b. 1/2 mm out c. 2 mm in d. 1/2 mm in A -4.75 D.S. lens decentered 4 millimeters produces how much prism? a. 1.9 b. 1.0 c. 4.75 d. 4.0 Which of the following areas is NOT a factor in determining vertical imbalance? a. Reading depth b. Sphere power in the 90 degree meridian c. Cylinder power in the 90 degree meridian d. ADD power A 4X microscope lens has a dioptric value of about: a. +4.00D b. +8.00D c. +16.00D d. +2.00D
Which of the following lenses has no power in the 90 degree meridian? a. +2.00 -2.00 x 090 b. +2.00 +2.00 x 180 c. +1.00 -2.00 x 045 d. +1.00 +1.00 x135 Rx: OD: +3.00 +1.00 x 045 4.0 BU OS: +2.50 +1.50 x 135 3.0 BO When splitting the prism equally between both eyes the result is: a. OD: 2 BU 1 1/2 BO / OS: 2 BU 1 1/2 BO b. OD: 2 BU 1 1/2 BI / OS: 2 BD 1 1/2 BO c. OD: 2 BU 1 1/2 BO / OS: 2 BD 1 1/2 BO d. OD: 2 BU 1 1/2 BI / OS: 2 BU 1 1/2 BI To achieve corrected curves on a -6.00 -1.00 x 180 convex semi-finished blank, select a ___ for the front surface: a. +3.00 D b. +6.00 D c. +9.00 D d. +10.00 D When using a lensometer, a standard fused bifocal [Show Less]