You should not ask the patient like “ which letters do you see more cle
arly, on the red ground or on the green one? ” According to the patien
t’s corrected visual acuity, in case of 1.0 (20 in 20/20, 6 in 6/6), ask con
cretely like “ On which ground do you see the number 2, 9 more clearl
y, red or green? ” If the corrected visual acuity is lower, ask the patient
to read the bigger letter (3, 4, 5) in the higher area.
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