home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Contact Lens Series
/
Contact Lens Series Volume 1.iso
/
pc
/
prefit.dxr
/
00049_Field_49.txt
< prev
next >
Wrap
Text File
|
1997-10-28
|
447b
|
17 lines
CALIBRATION OF THE VISUAL ACUITY CHART
Another way to check the
calibration of the projected
acuity chart is to use the
calibration chart supplied with
many projectors. It has the
20/200 (6/60) letter printed the
appropriate sizes for different
viewing distances. Hold the
appropriate printed letter on
the screen next to the projected
letter to determine if the
projected letter is the correct size.