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Effects of visual processing and congenital nystagmus on visually guided ocular motor behaviour
Johan Pel1, Lisette Van Der Does, Fleur Boot
1Vestibular and Ocular Motor Research Group, Department of Neuroscience, Erasmus MC, Rotterdam, The Netherlands. j.pel@erasmusmc.nl
Insights
Visually guided eye movements mature in the first three years of life. Children with cerebral visual impairment (CVI) show prolonged reaction times to fixation (RTF), indicating visual processing deficits.
Area of Science:
- Ophthalmology
- Neuroscience
- Developmental Pediatrics
Background:
- Visually guided ocular motor behavior is crucial for visual development.
- Children with visual processing or motor deficits may exhibit atypical eye movement patterns.
- Understanding these patterns can aid in early diagnosis and intervention.
Purpose of the Study:
- To compare visually guided ocular motor behavior in children with visual deficits to typically developing children and adults.
- To investigate the relationship between specific visual impairments and ocular motor responses.
- To determine the developmental trajectory of visually guided eye movements.
Main Methods:
- Compared ocular motor behavior (reaction time to fixation - RTF, gaze fixation area - GFA) in children with visual processing/motor deficits (n=28), typically developing children (n=213), and adults (n=11).
- Included participants with cerebral visual impairment (CVI), opticopathy, nystagmus, glaucoma, or cataract; excluded those with low visual acuity or certain neurological/psychiatric conditions.
- Utilized Mann-Whitney U tests and Bonferroni post-hoc analysis to compare groups and assess age-related changes.
Main Results:
- Children with CVI demonstrated significantly prolonged RTF.
- Children with congenital nystagmus exhibited significantly increased GFA.
- In typically developing children, RTF was longer in those under 2 years compared to those 4 years and older (p < 0.001); GFA showed no developmental change.
Conclusions:
- Prolonged RTF in CVI suggests underlying visual processing deficits.
- Visually guided ocular motor responses mature significantly within the first three years of life.
- These findings highlight critical developmental periods for visual-motor integration.
Aim:
The aim of this study was to compare visually guided ocular motor behaviour in children with visual processing and/or motor deficits with an age-matched comparison group and an adult group.
Method:
Visual stimuli were shown to 28 children with visual processing and/or motor deficits (11 females, 17 males; mean age 7y 5mo, SD 2y 9mo, range 2-14y;) and an age-matched comparison group of 213 typically developing children (115 females, 98 males; mean age 5y 8mo, SD 3y 5mo, range 0-12y). The adult group consisted of nine females and two males with (mean age of 24y 4mo, SD 4y 8mo). Individuals who had a likely diagnosis of cerebral visual impairment (CVI), an opticopathy with unknown location, nystagmus, glaucoma, or a cataract were included in the study. Exclusion criteria were a visual acuity below 0.2, a developmental age under 1 year, and the presence of brain tumours, autism, and anxiety disorders. Orientating eye movements to large cartoons were quantified using the reaction time to fixation (RTF) and gaze fixation area (GFA). A Mann-Whitney U test was used to compare the differences between groups and Bonferroni post-hoc testing was used to analyse age dependence of RTF and GFA values within the comparison group.
Results:
Individuals with CVI showed significantly prolonged RTF values; those with congenital nystagmus showed significantly increased GFA values. In the comparison group, RTF was significantly longer in children under the age of 2 years than in children aged 4 years and older (290 and 200 ms respectively; p < 0.001). No developmental change was found for GFA values.
Interpretation:
Increased RTF values in individuals with CVI relate to visual processing deficits. The data suggest that visually guided ocular motor responses mature during the first 3 years of life.
