Assessment of Vision Lecture 3 Astigmatic Refraction

Question 1 of 10

1

Fill the blank spaces to complete the text.

The of is the relative retinal position where focal lines on two axes at 90 degrees to each other have the smallest variation.

Explanation

Question 2 of 10

1

Fan and Block is more accurate than Jackson Crossed Cylinder

Select one of the following:

True
False

Explanation

Question 3 of 10

1

For every two steps on the phoropter of negative cylinder, you must balance it out with:

Select one of the following:

One step of negative cylinder in the other meridian.
One step of positive sphere
One step of negative sphere
Two steps of positive sphere

Explanation

Question 4 of 10

1

If the handle of the Jackson crossed cylinder is held horizontally, which direction are the axes at?

Select one of the following:

45/135
90/180

Explanation

Question 5 of 10

1

For greater visual acuity, you want the patient to have a _________ interval of Sturm

Select one of the following:

Large
Small

Explanation

Question 6 of 10

1

When determining the axis of the cylinder, the patient will prefer the view with minus cyl acis closest to their minus cyl axis.

Select one of the following:

True
False

Explanation

Question 7 of 10

1

Checking either side of our suspected lens/axis in clinical practice is called:

Select one of the following:

Fogging
Dobbing
Bracing
Bracketing

Explanation

Question 8 of 10

1

To get an estimate of the patient's Rx, you would consider:

Select one or more of the following:

K readings
Fan
Ophthalmoscopy
Their previous Rx
Autorefractor
Retinoscopy

Explanation

Question 9 of 10

1

You can never mix Fan and Jackson Crossed cyl procedures

Select one of the following:

True
False

Explanation

Question 10 of 10

1

On the clock face, the patient says 4 o'clock and 10 o'clock look clearest. Their axis is approximately:

Select one of the following:

60 degrees
90 degrees
120 degrees
150 degrees
30 degrees

	Created by Johnny Van Ling over 5 years ago

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

Assessment of Vision Lecture 3 Astigmatic Refraction

Assessment of Vision Lecture 3 Astigmatic Refraction

Question 1 of 10

Fill the blank spaces to complete the text.

The of is the relative retinal position where focal lines on two axes at 90 degrees to each other have the smallest variation.

Explanation

Question 2 of 10

Fan and Block is more accurate than Jackson Crossed Cylinder

Select one of the following:

Explanation

Question 3 of 10

For every two steps on the phoropter of negative cylinder, you must balance it out with:

Select one of the following:

Explanation

Question 4 of 10

If the handle of the Jackson crossed cylinder is held horizontally, which direction are the axes at?

Select one of the following:

Explanation

Question 5 of 10

For greater visual acuity, you want the patient to have a _________ interval of Sturm

Select one of the following:

Explanation

Question 6 of 10

When determining the axis of the cylinder, the patient will prefer the view with minus cyl acis closest to their minus cyl axis.

Select one of the following:

Explanation

Question 7 of 10

Checking either side of our suspected lens/axis in clinical practice is called:

Select one of the following:

Explanation

Question 8 of 10

To get an estimate of the patient's Rx, you would consider:

Select one or more of the following:

Explanation

Question 9 of 10

You can never mix Fan and Jackson Crossed cyl procedures

Select one of the following:

Explanation

Question 10 of 10

On the clock face, the patient says 4 o'clock and 10 o'clock look clearest. Their axis is approximately:

Select one of the following:

Explanation