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ABO Practical Exam: Lensometry and Prism, Exams of Nursing

University of Phoenix (UOPX)Nursing

A comprehensive guide to lensometry and prism concepts, covering essential aspects like lensmeter operation, prism calculations, and reference points on progressive lenses. It includes practical exercises and questions to reinforce understanding of key concepts.

Typology: Exams

2024/2025

Available from 01/17/2025

Chris-Dafoe
Chris-Dafoe 🇺🇸

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ABO Practical Exam
Cancelling effect- subtract prism amounts correct answersBU/BU
BD/BD
BI/BO
Powers between 0.00 & +/- 3.00 correct answersRead in 1/8 diopters
.12
.37
.62
.87
Lensometer is also referred to as correct answersLensmeter, focimeter, vertometer
To focus eyepiece correct answers1) while turned off. Place white sheet of paper against lens stop.
2) turn focus ring all the way counter clockwise,and then back clockwise until sharp.
3) remove paper and turn lensometer on
4) move power drum to high plus, then turn away from you until sharp- should land at 0.00.
To read HORIZONTAL prism correct answersAxis must be @ 180°, if not, transpose rx.
P=hcmxd correct answersPrentice rule
P(prism)
Hcm(amount moved)
D(diopter)
BO/BO correct answersCompounds- add
pf3
pf4

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ABO Practical Exam

Cancelling effect- subtract prism amounts correct answersBU/BU BD/BD BI/BO Powers between 0.00 & +/- 3.00 correct answersRead in 1/8 diopters . . . . Lensometer is also referred to as correct answersLensmeter, focimeter, vertometer To focus eyepiece correct answers1) while turned off. Place white sheet of paper against lens stop.

  1. turn focus ring all the way counter clockwise,and then back clockwise until sharp.
  2. remove paper and turn lensometer on
  3. move power drum to high plus, then turn away from you until sharp- should land at 0.00. To read HORIZONTAL prism correct answersAxis must be @ 180°, if not, transpose rx. P=hcmxd correct answersPrentice rule P(prism) Hcm(amount moved) D(diopter) BO/BO correct answersCompounds- add

BI/BI correct answersCompounds- add BU/BD correct answersCompounds- add BU/BU correct answersCancels- subtract BD/BD correct answersCancels- subtract BI/BO correct answersCancels- subtract Black numbers on lensometer power drum correct answers(+) Red numbers on lensometer power drum correct answers(-) When neutralizing, if you have a power that is in 1/8 diopters and need to subtract correct answersAdd 1 to 1/8 amount Ex. .12, you would need to subtract. Focus sphere lines first, if cylinder lines focus first correct answersRotate axis drum by 90° When you have cylinder power, turn the power drum to correct answersThe high plus, then gradually reduce power until one of the meridians comes into focus. Where is the prism reference point (PRP) on progressives? correct answerscentered directly between the two horizontal alignment engravings (or ink markings), usually about 2 to 4 mm below the fitting cross of the lens. Where is the distance reference point (DRP) located on progressive lenses? correct answersgenerally located approximately 4 mm above the Fitting Point, providing an area completely free of the progressive power gradient.

Single vision- intermediate When should you use occluder? correct answersFor noticeable eye abnormalities. Ex.: Strabismus. Also to check binocular PD by occluding each eye to see if eye moved when occluded. How to check for vertical imbalance correct answers1) mark OD, OC by centering within retical

  1. without moving the lens table, move to OS lens
  2. if not still centered, there is imbalance. What type of Lens design has vertical imbalance as part of its design? correct answersProgressive lenses Measure cylinder value of the lens by: bringing far lines into focus, THEN: correct answersSubtract current measurement on power drum from spherical reading. PD for Single vision & progressive correct answersMonocular PD for bifocals and trifocals correct answersBinocular Fill in all parts of the reading values found in the correct form, including all: correct answersZeros Ex. X 090 +0.