Essilor CP550EA Manuel D'utilisation page 23

Visual acuity of between 1/20 and 20/10
o
Specific tests:
o
Filters:
o
Mask:
o
Instrument's range CP550 (CP550EA, CP550EB, CP550SB) can all be connected to APH 550
ESSILOR UMCP550 V1 OCT2015
Letters, Landolt rings and Snellen "E" chart: logarithmic scales,
Numerals and morphoscopic optotypes: decimal scales.
Polarized binocular vision tests: stereoscopy, heterophoria, aniseikonia, binocular and
biocular balance (duochrome, double row of numbers),
Tests of astigmatism: Parent dial, shot test, crosshairs,
Other: point light source, Worth test.
Duochrome
Vertical and horizontal lines,
Isolated optotype.
21
.