EZER EDR 9000, Operation Manual

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Operation
Operation
Manual
Manual
10.20 Ve rtic a l Co in c id e n c e ( An is e iko n ia ) Te s t
! Purpose: In subjective test, process Aniseikonia and Vertical Heterophoria by Coincidence
(Aniseikonia) Chart.
! Chart: Vertical Coincidence(Aniseikonia) Chart
! Auxiliary Lens: Polarized Filter with 135 degrees for right eye, and 45 degrees for left eye.
!
Target: The right half of the square seen with the right eye and the left half of the square seen
with the left eye must be arranged as a regular square, with a standard of Fixation.
! Way of Test
1. On Special Chart clause of touch screen, enter Vertical
Heterophoria Mode by pressing Coincidence (Aniseikonia)
Chart.
2. Ask the patient if he sees the square chart well, if yes, ask if that square chart is tilted
toward up and down, or is arranged straight.
▶
When the left square chart is tilted upside: “Upside Heterophoria of right eye.” Turn
the dial counterclockwise to increase BD prism, until the square is arranged straight.
▶
When the right square chart is tilted toward upside: “Upside Heterophoria of left
eye.” Turn the dial clockwise to increase BU prism, until the square is arranged straight.
3. As a final check, ask the patient if he sees the dot in the middle and the square chart,
and
whether the sizes of upper and lower square are of same.
▶
If the sizes of the left and right square are the same, press [OK].
▶
It the sizes of the left and right square are different, press [NG].
[Figure 10-20] Vertical Coincidence(Aniseikonia) Test