home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Contact Lens Series
/
Contact Lens Series Volume 1.iso
/
mac
/
Contact Lens Series V1(MAC)
/
Prefit.DIr
/
00048_Field_48.txt
< prev
next >
Wrap
Text File
|
1997-10-29
|
523b
|
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
patientΓÇÖs 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).