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The contrast sensitivity of the newborn human infant

Angela M Brown1, Delwin T Lindsey2, Joanna G Cammenga1

  • 1College of Optometry, The Ohio State University, Columbus, Ohio, United States.

Investigative Ophthalmology & Visual Science
|January 8, 2015
PubMed

Insights

This study successfully measured binocular contrast sensitivity (CS) in newborn infants using a card procedure. The findings demonstrate that infant CS can be reliably assessed, providing valuable data for infant vision development.

Area of Science:

  • Ophthalmology
  • Developmental Neuroscience
  • Pediatric Vision

Background:

  • Assessing visual function in newborns is crucial for early detection of potential vision impairments.
  • Contrast sensitivity (CS) is a key indicator of visual acuity and development.
  • Limited data exists on binocular CS in neonates using standardized, accessible methods.

Purpose of the Study:

  • To quantify binocular contrast sensitivity (CS) in healthy newborn infants.
  • To validate a fixation-and-following card procedure for infant CS measurement.
  • To establish normative CS values for the neonatal period.

Main Methods:

  • Employed a fixation-and-following card procedure to measure CS in 119 healthy newborns.
  • Utilized square-wave gratings at varying spatial frequencies (0.06 and 0.10 cyc/deg).
  • Applied the descending method of limits and randomized/masked designs with experienced and novice observers.

Main Results:

  • Newborn infants demonstrated a CS of 2.0 for vertical gratings and 1.74 for horizontal gratings.
  • Infant CS standard deviation was comparable to adult values measured with the Pelli-Robson chart.
  • Observer experience, stimulus randomization, and masking did not significantly impact CS measurements.

Conclusions:

  • The fixation-and-following card procedure is a viable method for measuring individual newborn infant contrast sensitivity.
  • This technique provides a reliable and accessible means to assess early visual development in neonates.
  • The study establishes a foundation for further research into visual development and potential interventions.
Abstract

Keywords:
card procedurecontrast sensitivityfixation-and-followingneonatalnewborn

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