The of is the relative retinal position where focal lines on two axes at 90 degrees to each other have the smallest variation.
Fan and Block is more accurate than Jackson Crossed Cylinder
True
False
For every two steps on the phoropter of negative cylinder, you must balance it out with:
One step of negative cylinder in the other meridian.
One step of positive sphere
One step of negative sphere
Two steps of positive sphere
If the handle of the Jackson crossed cylinder is held horizontally, which direction are the axes at?
45/135
90/180
For greater visual acuity, you want the patient to have a _________ interval of Sturm
Large
Small
When determining the axis of the cylinder, the patient will prefer the view with minus cyl acis closest to their minus cyl axis.
Checking either side of our suspected lens/axis in clinical practice is called:
Fogging
Dobbing
Bracing
Bracketing
To get an estimate of the patient's Rx, you would consider:
K readings
Fan
Ophthalmoscopy
Their previous Rx
Autorefractor
Retinoscopy
You can never mix Fan and Jackson Crossed cyl procedures
On the clock face, the patient says 4 o'clock and 10 o'clock look clearest. Their axis is approximately:
60 degrees
90 degrees
120 degrees
150 degrees
30 degrees