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10.8 Cylinder Axis Test
Purpose: Obtain maximum revised circumference degrees by 30 degrees’ unit for Monocular,
using Clock Dial, Subjective test.
Chart: Clock Dial
Auxiliary Lens: None
Target: All the lines must be seen as equally.
Way of Test
1. On Chart clause of touch screen, press Clock Dial button to change it into distorted
vision test mode.
2. Press (R) or (L) to choose the field for test.
3. On the touch screen, Press (S) or left/right button to change it to Spherical Power
mode, and add Fogging until the line of Clock Dial is seen equally.
4. Question the patient like, ‘In which hour direction line is seen the thickest and the
darkest?”
5. When the patient says all the lines are seen equally, he is determined not to have
distorted vision. If a certain bar is seen thicker, multiply 30 by the number seen by that
bar, and press [A] or left/right button to fix the distorted vision axis.
[Figure 10-8] Test of Cylinder Axis
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