Topcon PixelChart PC-50S - Contrast and Customization

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INDICATION OF CHART
Special function (Single rate character contrast)
It is possible to indicate the whole chart in the single contrast rate.
The example of use is shown below.
1 Indicate the tumbling E chart [0.2-0.4].
2 Touch the [Contrast] button among the function buttons.
The contrast selection menu is displayed.
3 Select "Contrast" from the contrast selection menu. When the contrast has been changed and
you press the [] or [] switch, the chart can be changed in the changed contrast condition.
The contrast can be changed by the following stages, "100%, 50%, 25%, 12.5%, 10%, 5.0%,
2.5%".
When the contrast has been changed, touch the other visual acuity chart (excluding "screening")
button. The chart can be changed in the changed contrast condition.
Touch the [Exit] button on the contrast selection menu, and contrast is canceled.