ABO Review Quiz 3 – Lens Form by admin | May 4, 2010 | ABO Review | 11 comments ABO Review Quiz - Lens Form OpenOptix ABO Study Guide: Chapter 3 31 Questions A lens clock is used to measureastigmatismpupillary distancevertex distancebase curveTranspose the following prescription: +2.25 +1.75 X 085+2.25 -1.75 X 085-4.00 +1.75 X 175+4.00 -1.75 X 175-2.25 +1.75 X 085Equiconcave, flat concave, and meniscus are ALL types of minus lensesplus lensesastigmatic lensesspherocylinder lensesEquiconvex, flat convex, and meniscus are ALL types of:minus lensesplus lensesastigmatic lensesspherocylinder lensesThe reason for usingĀ a "best form" lens is to minimizeaberrationsweightmagnificationindexA lens has a front surface power of +2.00D and a back surface power of -8.25D. The corrective power is-8.25D-5.75D+2.00D-6.25DWhat is the best base curve for a -3.75D lens?42-4-2Using the prescription +2.00 -1.50 X 45, what is the power of the lens at the 90th meridian?0.521.25-0.5How much cylinder power is in effect at the specified axis?0%25%50%100%A plus lens diverges lightconverges lightis two prisms placed apex to apexis concaveA minus lensis thick in the centerconverges lightis thin in the centeris two prisms placed base to baseTranspose the following prescription: -0.75 +3.00 X 180+2.25 -3.00 X 180-0.75 -3.00 X 090+2.25 +3.00 X 180+2.25 -3.00 X 090Using the prescription -1.00 -1.50 X 90, what is the power of the lens at the 180th meridian?-2.5-1-0.5-1.5What is the best base curve for a +2.50D lens?86104Eyeglass prescription powers are written in _________.AxisPrismsdioptersdegreesAxis is ____________.a notation of positiona notation of power on a lensalways greater than 180 degreesused on spherical RxTo switch between minus and plus cylinder forms we use _____.cylinder conversionthe cylinder powers formulatranspositiondegree conversionPlus lenses ________ and minus lenses ________. magnify, minifyMinify, magnifyNeutralize, verifyMyopia, hyperopiaThe spherical equivalent of the lens +1.00 +2.50 x 90 is:+1.50D+2.25D+2.50D+3.50DIf the prescription is O.D. +1.00 +2.50 x 45, what would be the total power at axis 90?+1.00D+2.00D+2.25D+2.SODWhich of the following lenses has no power in the 90+2.00 -2.00 x 90+2.00 +2.00 x 180+1.00-2.00 x 45+1.00+1.00x135Given an Rx with all specifications equal but ground in material of different indices, which set of lenses will be the thinnest?Crown glassPolycarbonateCR-39Photo-Gray ExtraA lens having one concave and one convex surface is called a __________ lens.BiconvexToricBiconcaveMeniscusThe dioptric difference between the lenses for the prescription of O.D. +2.00 sph, O.S. +0.50 sph would be:0.50Dl.00D1.50D2.00DAstigmatism is corrected by a lens having:Plus powerMinus powerCylinder powerPrism PowerGiven the prescription +1.00 +1.00 axis 90, how much of the +1.00 cylinder is in effect at axis 90 (the vertical meridian of the lens)?100%90%50%0%A myope always has in his or her prescription the following kind of power:Minus powerPlus powerCylinder powerAxisA hyperope always has in his or her prescription the following power:Minus powerPlus powerCylinder poweraxisIf a +10D lens is moved 5 mm nearer the eye, it will be about:0.25D stronger plus0.25D weaker plus0.50D stronger plus0.50D weaker plusThe relationship of front and back curvatures on a spectacle lens will determine:Refractive powerSegment positionEffective diameterDecentrationHow much cylinder power is in effect 90 degrees away from the specified axis?0%50%25%100%