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Maturation of Binocular, Monocular Grating Acuity and of the Visual Interocular Difference in the First 2 Years of

Marcelo Fernandes Costa1,2, Valtenice de Cássia Rodrigues Matos França1, Mirella Teles Salgueiro Barboni1,2

  • 11 Laboratório de Psicofisiologia Sensorial, Departamento de Psicologia Experimental, Instituto de Psicologia, Universidade de São Paulo, São Paulo, Brazil.

Clinical EEG and Neuroscience
|August 29, 2017
PubMed

Insights

Sweep visual evoked potential (sVEP) measures infant visual acuity. This study reveals distinct maturation curves for binocular and monocular sVEP acuity and provides age-specific norms, crucial for diagnosing conditions like amblyopia.

Area of Science:

  • Ophthalmology
  • Developmental Neuroscience
  • Visual Electrophysiology

Background:

  • Sweep visual evoked potential (sVEP) is a reliable method for assessing infant visual acuity.
  • Limited literature exists on sVEP acuity maturation, interocular acuity development, and normative data in early infancy.

Purpose of the Study:

  • To measure binocular and monocular sVEP acuities in healthy infants from birth to 24 months.
  • To analyze the maturation patterns of visual acuity and interocular acuity differences (IAD).
  • To establish normative ranges for sVEP acuity in infants.

Main Methods:

  • sVEP acuities (binocular and monocular) were recorded in 481 healthy infants (0-24 months).
  • Data analysis focused on acuity maturation, IAD, and age-related normative values.
  • Statistical comparisons were made between binocular and monocular measurements.

Main Results:

  • Binocular sVEP acuity was consistently higher than monocular acuity across all age groups.
  • Monocular acuity exhibited two critical maturation periods, while binocular acuity showed three.
  • The mean IAD range decreased significantly with age, from 1.45 cpd at birth to 0.31 cpd at 24 months.

Conclusions:

  • Binocular and monocular sVEP acuities demonstrate distinct developmental trajectories.
  • Interocular acuity differences diminish with age and are important considerations for clinical assessments.
  • This study provides essential normative data for sVEP acuity in infants, aiding in the diagnosis of visual impairments like amblyopia.

Keywords:
critical periodearly infancygrating acuitysweep VEPtolerance limitsvisual development

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