Assessment of Vision Lecture 3 Astigmatic Refraction

Johnny Van Ling
Quiz by Johnny Van Ling, updated more than 1 year ago
Johnny Van Ling
Created by Johnny Van Ling over 2 years ago
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Description

A Quick 10-Question Quiz on the process of determining astigmatic refraction error in clinical practicet.

Resource summary

Question 1

Question
The [blank_start]circle[blank_end] of [blank_start]least[blank_end] [blank_start]confusion[blank_end] is the relative retinal position where focal lines on two axes at 90 degrees to each other have the smallest variation.
Answer
  • circle
  • least
  • confusion

Question 2

Question
Fan and Block is more accurate than Jackson Crossed Cylinder
Answer
  • True
  • False

Question 3

Question
For every two steps on the phoropter of negative cylinder, you must balance it out with:
Answer
  • One step of negative cylinder in the other meridian.
  • One step of positive sphere
  • One step of negative sphere
  • Two steps of positive sphere

Question 4

Question
If the handle of the Jackson crossed cylinder is held horizontally, which direction are the axes at?
Answer
  • 45/135
  • 90/180

Question 5

Question
For greater visual acuity, you want the patient to have a _________ interval of Sturm
Answer
  • Large
  • Small

Question 6

Question
When determining the axis of the cylinder, the patient will prefer the view with minus cyl acis closest to their minus cyl axis.
Answer
  • True
  • False

Question 7

Question
Checking either side of our suspected lens/axis in clinical practice is called:
Answer
  • Fogging
  • Dobbing
  • Bracing
  • Bracketing

Question 8

Question
To get an estimate of the patient's Rx, you would consider:
Answer
  • K readings
  • Fan
  • Ophthalmoscopy
  • Their previous Rx
  • Autorefractor
  • Retinoscopy

Question 9

Question
You can never mix Fan and Jackson Crossed cyl procedures
Answer
  • True
  • False

Question 10

Question
On the clock face, the patient says 4 o'clock and 10 o'clock look clearest. Their axis is approximately:
Answer
  • 60 degrees
  • 90 degrees
  • 120 degrees
  • 150 degrees
  • 30 degrees
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