The relation between visual functions, functional vision, and bimanual function in children with unilateral cerebral palsy.
Quick visual-perception scores predict how well kids with hemiplegia will use both hands—screen vision first, then target two-hand goals.
01Research in Context
What this study did
Crotti et al. (2024) watched the kids with unilateral cerebral palsy.
They gave each child three short tests: visual perception, real-life vision use, and two-hand tasks like cutting and tying shoes.
Then they ran numbers to see if vision scores could predict how well the kids used both hands together.
What they found
Kids who scored low on visual-perception games also scored low on bimanual tests.
The link was strongest for visual perception; it explained almost half of the difference in two-hand skills.
Everyday vision use mattered too, but not as much.
How this fits with other research
Rana et al. (2024) looked at preschoolers and found that sensory problems show up early in autism.
Together the papers say: check vision and other senses soon, no matter the diagnosis.
de Leeuw et al. (2024) tested balance in kids with Prader-Willi syndrome and saw the same pattern—poor sensory input leads to poor motor output.
All three studies agree: sensory screening should come before motor goals.
Why it matters
Before you write a bimanual goal, give a quick visual-perception test like the Motor-Free Visual Perception Test.
If the child scores low, add vision games first.
Ten extra minutes of screening can save weeks of slow motor progress.
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02At a glance
03Original abstract
BACKGROUND: Accurate visual information is needed to guide and perform efficient movements in daily life. AIMS: To investigate the relation between visual functions, functional vision, and bimanual function in children with unilateral cerebral palsy (uCP). METHODS AND PROCEDURES: In 49 children with uCP (7-15 y), we investigated the relation between stereoacuity (Titmus Stereo Fly test), visual perception (Test of Visual Perceptual Skills), visuomotor integration (Beery Buktenica Test of Visual-Motor Integration) and functional vision (Flemish cerebral visual impairment questionnaire) with bimanual dexterity (Tyneside Pegboard Test), bimanual coordination (Kinarm exoskeleton robot, Box opening task), and functional hand use (Children's Hand-use Experience Questionnaire; Assisting Hand Assessment) using correlations (rs) and elastic-net regularized regressions (d). OUTCOMES AND RESULTS: Visual perception correlated with bimanual coordination (rs=0.407-0.436) and functional hand use (rs=0.380-0.533). Stereoacuity (rs=-0.404), visual perception (rs=-0.391 to -0.620), and visuomotor integration (rs=-0.377) correlated with bimanual dexterity. Functional vision correlated with functional hand use (rs=-0.441 to -0.458). Visual perception predicted bimanual dexterity (d=0.001-0.315), bimanual coordination (d=0.004-0.176), and functional hand use (d=0.001-0.345), whereas functional vision mainly predicted functional hand use (d=0.001-0.201). CONCLUSIONS AND IMPLICATIONS: Visual functions and functional vision are related to bimanual function in children with uCP highlighting the importance of performing extensive visual assessment to better understand children's difficulties in performing bimanual tasks. WHAT THIS PAPER ADDS: Previous findings showed that up to 62 % of children with unilateral cerebral palsy (uCP) present with visual impairment, which can further compromise their motor performance. However, the relation between visual and motor function has hardly been investigated in this population. This study makes a significant contribution to the literature by comprehensively investigating the multi-level relation between the heterogenous spectrum of visual abilities and bimanual function in children with uCP. We found that mainly decreased visual perception was related to decreased bimanual dexterity, bimanual coordination, and functional hand use while impairments in functional vision were only related to decreased functional hand use. Additionally, elastic-net regression models showed that visual assessments can predict bimanual function in children with uCP, however, effect sizes were only tiny to small. With our study, we demonstrated a relation between visual functions and bimanual function in children with uCP. These findings suggest the relevance of thoroughly examining visual functions in children with uCP to identify the presence of visual impairments that may further compromise their bimanual function.
Research in developmental disabilities, 2024 · doi:10.1016/j.ridd.2024.104792