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Visual acuity (VA) as the primary measure
•
Aim
to “
measure the
best possible corrected
VA under the
best
possible conditions
at every time point using an
age-
appropriate
test
”
•
Use a quantitative
continuous scal
e (logMAR based)
•
In case of poor cooperation and/or suspected visual decline “
it
is mandatory to
retest the child
”
(within 1-2 weeks)
•
it is crucial to “
exclude
refractive error, amblyopia, or other
non-OPG-related causes
”
•
A
national reference ophthalmologist
necessary
Heidelberg June 5th 2015, SIOP-BTG