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A biometric study of ocular changes during accommodation

P J Shum1, L S Ko, C L Ng

  • 1Department of Ophthalmology, Cathay General Hospital, Taipei, Taiwan, Republic of China.

American Journal of Ophthalmology
|January 1, 1993
PubMed
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Ocular accommodation causes significant changes in eye biometrics. Axial length increases, while anterior chamber depth decreases and lens thickness increases during focusing.

Area of Science:

  • Ophthalmology
  • Biometry
  • Physiological Optics

Background:

  • Ocular accommodation is the process by which the eye changes optical power to maintain a clear image or focus on an object as its distance varies.
  • Understanding biometric changes during accommodation is crucial for myopia progression research and optical correction design.

Purpose of the Study:

  • To investigate the biometric changes in anterior chamber depth, lens thickness, and axial length during ocular accommodation using A-mode ultrasonography.
  • To quantify the extent of axial length elongation and associated biometric shifts at different accommodative stimuli.

Main Methods:

  • A-mode ultrasonography was employed on 106 subjects divided into two groups.
  • Biometric parameters (anterior chamber depth, lens thickness, axial length) were measured in the right eye while the left eye underwent controlled accommodation stimuli.

Related Experiment Videos

  • Accommodative stimuli included focusing at 6m, 33cm, and in one group, an additional +3.0 diopters correction.

    • Main Results:

    • Accommodation consistently led to decreased anterior chamber depth and increased lens thickness across all subjects.
    • Significant axial length increase of 0.06 mm was observed at 33 cm in Group 1 (P < .0005).
    • Significant axial length increases were observed at 33 cm (0.05 mm) and 12.5 cm (0.05 mm) in Group 2 (P < .0005 for both).

    Conclusions:

    • Ocular accommodation induces significant changes in ocular biometry, including axial elongation.
    • The observed biometric shifts (decreased anterior chamber depth, increased lens thickness, increased axial length) are integral to the accommodative process.
    • These findings provide quantitative data on dynamic ocular changes during accommodation, relevant for optical modeling and understanding refractive error development.