ABO Review Quiz 3 – Lens Form

ABO Review Quiz – Lens Form
OpenOptix ABO Study Guide: Chapter 3
31 Questions

A lens clock is used to measure





Transpose the following prescription: +2.25 +1.75 X 085





Equiconcave, flat concave, and meniscus are ALL types of





Equiconvex, flat convex, and meniscus are ALL types of:





The reason for using a "best form" lens is to minimize





A lens has a front surface power of +2.00D and a back surface power of -8.25D. The corrective power is





What is the best base curve for a -3.75D lens?





Using the prescription +2.00 -1.50 X 45, what is the power of the lens at the 90th meridian?





How much cylinder power is in effect at the specified axis?





A plus lens





A minus lens





Transpose the following prescription: -0.75 +3.00 X 180





Using the prescription -1.00 -1.50 X 90, what is the power of the lens at the 180th meridian?





What is the best base curve for a +2.50D lens?





Eyeglass prescription powers are written in _________.





Axis is ____________.





To switch between minus and plus cylinder forms we use _____.





Plus lenses ________ and minus lenses ________.





The spherical equivalent of the lens +1.00 +2.50 x 90 is:





If the prescription is O.D. +1.00 +2.50 x 45, what would be the total power at axis 90?





Which of the following lenses has no power in the 90





Given an Rx with all specifications equal but ground in material of different indices, which set of lenses will be the thinnest?





A lens having one concave and one convex surface is called a __________ lens.





The dioptric difference between the lenses for the prescription of O.D. +2.00 sph, O.S. +0.50 sph would be:





Astigmatism is corrected by a lens having:





Given 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)?





A myope always has in his or her prescription the following kind of power:





A hyperope always has in his or her prescription the following power:





If a +10D lens is moved 5 mm nearer the eye, it will be about:





The relationship of front and back curvatures on a spectacle lens will determine:





How much cylinder power is in effect 90 degrees away from the specified axis?







7 Comments

  1. Question #5 is incomplete.

  2. What is the best base curve for a +2.50D lens?
    Shouldn’t that be 8.5 not 8? If you add 6 to the sphere power.

  3. Can anyone explain the simple way of understanding how to determine the effective powers at any meridian and a cylinder power. I DO NOT KNOW THE STEPS IF THERE IS. I am taking the ABO Exam this May 20,2012. GOD HELP ME!

  4. Q5 is incompleate… the q is The reason for using a “best form” lens is to minimize _________.

    • Thanks Lisa! It’s now fixed.

  5. To k13, if you do cross cilinder you get (-1.00 x 180) (-2.50 x 90). Why is the answer -2.50?

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