Digital Refractor CDR-9000 173
13.23. Vertical Von Graefe Test
-
Objective: To execute a vertical phoria test during the subjective test using V
on Graefe chart.
-
Chart: Vertical Von Graefe chart
-
Auxiliary Lens: Rotary prism (right), 10ΔBI prism (left)
-
Expectation: To make the right and left horizontal rod becomes horizontally a
ligned in the center.
1. To enter the vertical phoria mode, press the Von Graefe Chart twice Altern
ately, press the [TEST] button and then select “Vert. Von Graefe” Item of t
he touch screen to execute this test.
2. Or use the [BDBU] button in the horizontal Von Graefe Test mode.
3. Ask the patient as follows; “Are the two horizontal rods aligned?”
4. If “Yes”, finish this test since the patient has no phoria. If “No”, continue t
his test since the patient has phoria
5. Ask the patient as follows; “Which one is higher among the two horizontal
rods?”
6. If “The left one”: right eye with hyperphoria. Turn the dial counterclockwis
e to add the BD prism till the two rods are horizontally aligned.
7. If “The right one”: left eye with hyperphoria. Turn the dial clockwise to ad
d the BU prism till the two rods are horizontally aligned.
8. After finishing this test, press the [OK] button of the touch screen to save
(each results of phoria tests is maintained separately) or the [CANCEL] bu
tton of the touch screen to discard the result.
To Next Page