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00048_Field_48.txt
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1997-10-28
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524b
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23 lines
CALIBRATION OF THE VISUAL ACUITY CHART
The acuity chart must be accurately
calibrated. The calibration should
be periodically checked.
Checking Calibration:
1. Measure the distance from the
patientís eye position to the chart.
2. Measure the size of the 20/200
(6/60) letter
3. From the accompanying
chart determine if letter
size is correct. If not the
magnification of the
projector must be
changed (see following
screens).