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Published on: July 9, 2016
Measure of Early Vision Use: initial validation with parents of children with cerebral palsy
Belinda Deramore Denver1, Elspeth Froude1, Peter Rosenbaum2
1School of Allied Health, Australian Catholic University, North Sydney, Australia.
Insights
The Measure of Early Vision Use (MEVU) is a new, feasible online tool for assessing vision use in children with cerebral palsy. It shows preliminary evidence of validity and can aid early intervention planning.
Area of Science:
- Pediatric ophthalmology
- Developmental neuroscience
- Rehabilitation medicine
Background:
- Cerebral palsy (CP) often involves visual impairments, impacting a child's development and daily functioning.
- Assessing how children with CP utilize their vision is crucial for targeted interventions.
- Existing tools may not adequately capture the functional use of vision in this population.
Purpose of the Study:
- To establish initial psychometric properties of the Measure of Early Vision Use (MEVU).
- To evaluate the scale's dimensionality, construct validity, and feasibility.
- To provide a tool for understanding vision use in children with CP.
Main Methods:
- A 14-item parent-reported Measure of Early Vision Use (MEVU) scale was administered online.
- Data were collected from 100 parents of children with cerebral palsy (aged 0-12 years).
- Psychometric evaluation included Classical Test Theory (CTT) and hypothesis testing for construct validity.
Main Results:
- Principal components analysis indicated a unidimensional structure, explaining 66.7% of variance.
- The MEVU demonstrated high internal consistency (Cronbach's α = 0.96).
- The scale supported hypotheses, showing significant differences between children with and without cerebral visual impairment.
Conclusions:
- The MEVU is the first tool to specifically assess 'how vision is used' in children with CP.
- Preliminary evidence suggests the MEVU is a feasible, unidimensional scale with adequate construct validity.
- The MEVU has potential to inform early intervention planning for children with or at risk of CP.
Purpose:
To report initial psychometric evidence on the Measure of Early Vision Use.
Method:
Data on performance of the Measure of Early Vision Use scale were collected from 100 parents of children with cerebral palsy aged 0-12 years via online survey. Psychometric evaluation included assessment of scale dimensionality using Classical Test Theory and hypothesis testing for evidence of construct validity.
Results:
Principal components analysis of the 14-item parent-rated Measure of Early Vision Use revealed one component with an eigenvalue of 9.343, explaining 66.7% of variance; internal consistency was high (Cronbach's α = 0.96). Total scores ranged from 15-56 (Mean 42.8, standard deviation = 10.6). The results support seven pre-defined hypotheses including statistically significant differences in MEVU-total scores between children with and without parent-reported cerebral visual impairment.
Conclusions:
Measure of Early Vision Use is the first assessment tool to describe 'how vision is used' in children with cerebral palsy. Results provide preliminary evidence that the measure comprises a unidimensional construct, sufficient construct validity, and feasibility as a parent-completed online assessment. Findings on internal structure provide foundational evidence and require further testing with Confirmatory Factor Analysis or Rasch Analysis.IMPLICATIONS FOR REHABILITATIONThe Measure of Early Vision Use is a new instrument to describe the use of basic visual abilities and is feasible to use as a parent-completed online questionnaire.The Measure of Early Vision Use is a unidimensional scale with sufficient construct validity to supports its use as a measure of 'how vision is used' without confounding visual ability with the reason why it might be impaired (e.g., cerebral vision impairment, motor limitations, or cognition).There is potential for the Measure of Early Vision Use to support early intervention planning for children with (or at high risk of) cerebral palsy.
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