13 charts for special testing including
phoria test; muscle balance test; minute
stereo test to verify subjective refinement;
coincidence test; worth four-dot test;
fixation spot test; astigmatic dial; Snellen
letters with red/green filter; cross-cylinder
testing; vertical letters; horizontal letters;
and binocular refractive balance test.
• 3 children's charts (one 20/20 line),
• 5 number charts (two 20/20 lines),
• 4 illiterate E charts (two 20/20 lines), and
• 8 Snellen charts (five 20/20 lines, for a
total of ten 20/20 lines to prevent memorization).
• Mask buttons permit you to isolate
individual lines both horizontally and
vertically, as well as to isolate individual
letters, numbers and characters.
• Red/green filter can be used on any appropriate chart.
• The program buttons are used both for
programming the CP-690E and for using it
in a programmed sequence. Programming
the instrument is similar to setting a digital
watch. As you select each chart you want
to use, depress the button for that chart and
then depress the Program Button. To use
the CP-690E after it has been programmed,
press Start to start the chart sequence, then
press Next each time you want to advance
to the next chart.
• Two buttons allow you to move up or down
the Snellen chart range a line at a time
with a horizontal mask.