Vertical saccades in children: a developmental study

Area of Science:

• Ophthalmology
• Neuroscience
• Developmental Pediatrics

Background:

• Vertical saccades are essential for visual exploration but their developmental trajectory in children remains understudied.
• Understanding the maturation of vertical saccade control is crucial for identifying potential developmental delays or neurological conditions.

Purpose of the Study:

• To investigate the developmental changes in vertical saccades in a pediatric population.
• To analyze age-related differences in saccade latency, gain, and peak velocity.
• To explore potential differences in the development of upward versus downward saccades.

Main Methods:

• Utilized an infrared video oculography system (Mobile EBT®, e(ye)BRAIN) to record binocular eye movements in sixty-nine children.
• Analyzed saccade parameters including latency, gain, and peak velocity for both upward and downward movements.
• Compared saccade characteristics across different age groups within the pediatric cohort.

Main Results:

• Vertical saccade latency significantly decreased with increasing age in children.
• Saccade gain and peak velocity demonstrated an up-down asymmetry but remained stable throughout childhood.
• Latency was independent of saccade direction, while gain and peak velocity showed directional differences.

Conclusions:

• Vertical saccade latency development is linked to the maturation of cortical networks involved in saccade preparation.
• The stability of saccade precision and peak velocity suggests early development, potentially controlled by subcortical structures like the cerebellum and brainstem.
• The observed up-down asymmetry in vertical saccades may be an innate characteristic present from early development.