Potec PLC-8000 - Fan & Block Chart Function

- 20 -
16. Fan & Block Chart Function
 It will be shown in figure 11 when you press astigmatism chart button in twice.
 Figure. 11 is a normal astigmatism test chart and apart from that it can be used as an additional
test chart.
 Press Mask_up button to display the chart from 0 to 180 degree clockwise by the interval of 10
degree and for anti-clockwise display press Mask-down button. (figure no. 11)
 If the patient has astigmatism, the chart will be shown as figure no.12.
 Arrow mark will be adjusted until it appears clear. (See Figure no. 13)
 Adjust astigmatism axis as the arrow indicates using phoropter or PDR-7000 so that the patient
could see Figure 14.
Figure 11 Figure 12
Figure 13 Figure 14