Brain Tumours

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