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Optic nerve crescents and refractive error.

G W Fulk1, D A Goss, M T Christensen

  • 1College of Optometry, Northeastern State University, Tahlequah, Oklahoma.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|March 1, 1992
PubMed
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The optic nerve crescent

Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Optics

Background:

  • Refractive error development is influenced by ocular biometry.
  • The optic nerve crescent is a feature observed in some eyes.
  • Its potential impact on refractive error determination is not fully understood.

Purpose of the Study:

  • To investigate if the optic nerve crescent influences the relationship between axial length and corneal curvature in determining refractive error.
  • To analyze the association between optic nerve crescent presence and ocular biometric parameters.

Main Methods:

  • Recruited 224 subjects aged 8–25 years.
  • Performed subjective refraction, keratometry, axial length measurement, and optic nerve stereophotography.
  • Measured optic nerve crescents and analyzed data using logistic and simple regression.

Related Experiment Videos

Main Results:

  • Male gender and myopia were associated with larger optic nerve crescents.
  • The relationship between axial length and refractive error was significantly different in subjects with large crescents compared to those without.
  • A 1-mm increase in axial length correlated with 1.26 D of myopia in subjects with large crescents, versus 0.66 D in those with small or no crescents.

Conclusions:

  • The optic nerve crescent modifies the impact of axial length on refractive error.
  • Ocular biometric studies should consider the presence and size of optic nerve crescents.
  • This finding has implications for understanding myopia progression and refractive error development.