Methods for conceptualising ‘visual ability’ as a measurable construct in children with cerebral palsy

Table 3 Example of process to identify linking units and ICF-CY codes (Part I) and ‘visual ability’ themes & categories (Part II)

Part I				Part II
				Descriptive theme		Analytical theme
Measure	Item	Linking unit^a	ICF-CY code^b	Descriptive word for visual ability	Indicator of visual ability	Theme: Observable visual behaviour	Category of visual ability behaviour
CVI Q [16]	Manipulates an object rather than look at it (Item 40, Other senses domain)	Use of other senses	d110 Watching d1201 Touching^c	Look	Look at object Manipulate rather than look (other senses)	Watches and/or visually interacts with objects Frequency of use of vision in activities	Interactions Use of vision
FVQ [18]	Tracks an object/toy (Item 2)	Tracking	d110 Watching	Tracking	Tracks an object/toy	Follows	Abilities
						Watches and/or visually interacts with objects	Interactions
PreViAs [24]	Is he/she able to look towards a sound source? (Item 3)	Looking toward a sound source^d	d110 Watching b2302 Localisation of a sound source	Look	Looks toward sound source	Searches	Abilities
VSI [36]	Does your child reach for a large, bright, silent object? (Item 17)	Reaching	d4452 Reaching	n/a

^aLinking unit = What is the item about?; ^bOnly assessment items which have been linked to an ICF-CY ‘visual ability’ code of d110 Watching, d160 Focusing attention or d161 Directing attention are included in Part II; ^cThis is an example where the exact term in the ICF-CY does not match the construct as described in the measure i.e., linked to d1201 Touching and not d4402 Manipulating; ^dExample of an item where it was not easy to identify what the item was about e.g., is it about ‘Turning to look’?, ‘Hearing a sound’ or ‘Looking’

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