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Myopia: Anatomic Changes and Consequences for Its Etiology.

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Emmetropization involves axial elongation after age two, causing retinal thinning and reduced pigment cell density in specific eye regions. Macular thickness and cell density remain unaffected, suggesting a tube-like globe expansion.

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Area of Science:

  • Ophthalmology
  • Developmental Biology
  • Retinal Physiology

Background:

  • Emmetropization is the eye's refractive development after infancy.
  • Early eye growth is spherical, followed by axial elongation.
  • Understanding emmetropization mechanisms is crucial for myopia research.

Purpose of the Study:

  • To investigate the microstructural changes during emmetropization after two years of age.
  • To elucidate the mechanisms behind axial elongation and its impact on retinal layers.
  • To determine the relationship between axial length and macular versus peripheral retinal structures.

Main Methods:

  • Histological analysis of ocular tissues.
  • Measurement of retinal thickness, RPE cell density, and Bruch's membrane (BM) thickness.
  • Correlation of these measurements with axial length.

Main Results:

  • Axial elongation after age two is linked to retinal thinning and reduced RPE cell density peripherally.
  • Choroid and sclera thin equatorially and posteriorly during axial elongation.
  • Macular retinal thickness, RPE density, and BM thickness are independent of axial length.

Conclusions:

  • Axial elongation may occur via additional BM production in equatorial regions, leading to peripheral thinning.
  • This process results in a more tubular globe enlargement, preserving macular function.
  • The development of the gamma zone contributes to increased disc-fovea distance in myopia.