Table 1 Overview of methods at different stages in the trial

 Identification of children with motor impairment in the community

X

 Examination to confirm presence of CP

X

 Examination to exclude those ineligible

X

 Eligibility confirmed

X

 Recruitment with informed consent

X

 Ocular examination (visual function)

X

 Distance visual acuity (Lea symbols)

X

 Near vision acuity (Lea symbols)

X

 Visual acuity (Peek/Peekaboo)

X

 Grating acuity (Lea paddles)

X

 Contrast sensitivity (Hiding Heidi)

X

 Colour vision assessment (Ishihara chart)

X

 Visual fields assessment (Lea Flicker wand 280,000)

X

 Stereopsis (Butterfly stereo acuity test)

X

 Extraocular motility assessment

X

 Vergence test

X

 Smooth pursuit assessment

X

 Saccades assessment

X

 Ocular alignment

X

 Assessment of accommodation (near pupillary reaction)

X

 Cycloplegic refraction

X

 CVI/PVD assessment (functional vision assessment)

X

 Visual fixation

X

 Visual guidance, colour, visual memory

X

 Visual guidance, 3D recognition of concrete objects

X

 Visual recognition and line orientation

X

 Visual recognition of size, length and direction of lines

X

 Visual attention

X

 Visual search

X

 Facial recognition

X

 Baseline interviews

X

 Open-questions inventory

X

 IQI inventory (closed questions)

X

 PedsQL 3.0 CP

X

 PedsQL 4.0 CP

X

 Strength and Difficulties Questionnaire

X

 Data management

X

 Data entered into database

X

 Randomization

X

 IQI inventory

X

X

 Strategies selected by carers

X

–

 Telephone calls at 2, 4 and 6 weeks

X

–

 PedsQL 3.0 CP

X

X

 PedsQL 4.0 generic

X

X

 Strength and Difficulties Questionnaire

X

X

 IQI Inventory (closed-questions inventory)

X

X

 Strategies selected by carers

–

X