Phoria; Phoria Testing - Distance; Horizontal Phorias Test - Ametek Reichert Phoroptor VRx User Manual

Performing an Exam
Prism Testing
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Phoria

Phoria Testing - Distance

1. Press the PRISM button, or tap Prism.
2. Tap Phoria in the menu bar at the bottom of the screen.
Note: The Phoria test automatically places Prism power of 6 D BD in the right eye and 10 D BI in the
left eye. If these starting values need to be adjusted, refer to the Adjust Initial Values section of
this manual.

Horizontal Phorias Test

1. Select an appropriate test chart of a single vertical line of optotypes or a single optotype.
2. Verify that the patient can see two images, one up and one down.
3. Adjust initial values if the patient cannot see two targets.
4. Decrease BI Prism, until the patient indicates the two images are vertically aligned, like buttons on a shirt.
Note: The ending value may be BO prism.
5. Press the CONTROL KNOB, or tap Aligned.
Note: The magnitude of lateral Phoria is the power of the Prism when the images are aligned. It
appears in the dialog box in the field labeled "H".
Vertical Phorias Test
After the horizontal phoria is determined, the Prism power is restored to 10 BI Prism in the left eye, as a
starting value for the vertical phoria test.
1. Select an appropriate test chart of a single horizontal line of optotypes or a single optotype.
2. Verify that the patient can see two images.
3. Decrease BD Prism until the two images align horizontally, like headlights on a car, to measure the
vertical phoria.
Note: The ending value may be BU prism.
4. Press the CONTROL KNOB, or tap Aligned.
Note: The magnitude of the vertical Phoria is the power of the Prism when the images are aligned. It
appears in the dialog box in the field labeled "V".
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