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Related Experiment Videos

[Relationship between lens power in refraction].

M Bechmann1, M Schaumberger, C L Schönfeld

  • 1Augenklinik der Ludwig-Maximilians-Universität München. Martin.Bechmann@ak-i.med.uni-muenchen.de

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|September 10, 2002
PubMed
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In emmetropic eyes, lens power and axial length are coordinated. If axial length deviates, lens power compensates to maintain emmetropia, preventing ametropia.

Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Optics

Background:

  • Emmetropia requires coordinated ocular components: cornea power, lens power, and axial length.
  • The interplay between these factors in emmetropia is not fully understood.

Purpose of the Study:

  • To investigate the relationship between ocular dimensions and refractive error.
  • To understand how axial length and lens power interact to achieve emmetropia.

Main Methods:

  • Ocular dimensions (anterior chamber depth, lens thickness, vitreous chamber depth, axial length) measured via A-scan ultrasonography in 66 healthy subjects.
  • Corneal radius and refractive power determined by ophthalmometry.
  • Equivalent lens power calculated using the Gullstrand schematic eye model.

Related Experiment Videos

Main Results:

  • A strong correlation was observed between refraction and axial length.
  • Lens power was independent of refraction in the overall cohort.
  • In emmetropic eyes, lens power correlated well with axial length, with longer axial lengths associated with lower lens power.

Conclusions:

  • Axial length deviations in emmetropic eyes appear to be compensated by adjustments in lens power.
  • Failure of this compensatory mechanism can lead to ametropia.