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Non-invasive Optical Measurement of Cerebral Metabolism and Hemodynamics in Infants
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Non-invasive Optical Measurement of Cerebral Metabolism and Hemodynamics in Infants

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A longitudinal study of the biometric and refractive changes in full-term infants during the first year of life

F C Pennie1, I C Wood, C Olsen

  • 1Department of Optometry and Neuroscience, UMIST, PO Box 88, M60 1QD, Manchester, UK.

Vision Research
|October 6, 2001
PubMed

Insights

Infant eye growth shows quadratic axial length changes and linear anterior chamber depth changes during the first year. Refractive error reduces hyperopia, correlating with axial length, aiding emmetropization understanding.

Area of Science:

  • Ophthalmology
  • Developmental Biology
  • Biometry

Background:

  • Infant eye development is crucial for visual acuity.
  • Understanding longitudinal changes in ocular dimensions and refraction is key to emmetropization.
  • Previous studies have provided cross-sectional data, but longitudinal data in early infancy is limited.

Purpose of the Study:

  • To longitudinally track changes in ocular axial dimensions and refraction in infants during their first year of life.
  • To model the developmental trajectories of axial length, anterior chamber depth, and refractive error.
  • To investigate the relationship between axial length and refractive error in early infancy.

Main Methods:

  • Longitudinal study of 20 full-term infants (10 male, 10 female) from 4 to 53 weeks of age.
  • Ocular measurements using ultrasonography for axial length and anterior chamber depth, and retinoscopy for refraction.
  • Mixed-model regression analysis to model changes over time.

Main Results:

  • Axial length changes followed a quadratic pattern (AL=17.190+0.128x-0.0013x(2)), while anterior chamber depth changed linearly (ACD=2.619+0.018x).
  • Lens thickness remained relatively constant.
  • Spherical equivalent refraction showed a reduction in hyperopia (SER=2.982-0.032x), and astigmatism tended to decrease.
  • Mean hyperopic refractive errors were negatively correlated with axial lengths (SER=12.583-0.541AL).

Conclusions:

  • Infant eye growth is characterized by specific mathematical patterns in axial elongation and anterior chamber deepening.
  • The observed reduction in hyperopia and its correlation with axial length support theories of emmetropization.
  • Individual variations highlight the complexity of refractive development in early life.

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