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Evaluation of Ocular Diameter Parameters Using Swept-Source Optical Coherence Tomography.

Jing Dong1, Jinhan Yao2, Shuimiao Chang2

  • 1Department of Ophthalmology, First Hospital of Shanxi Medical University, Taiyuan 030001, China.

Medicina (Kaunas, Lithuania)
|May 27, 2023
PubMed
Summary

Iridocorneal angle-to-angle (ATA) and sclera spur-to-sclera spur (STS) diameters are longer vertically than horizontally, unlike white-to-white (WTW) measurements. These findings improve sizing accuracy for implantable collamer lenses (ICLs) and anterior chamber intraocular lenses (ACIOLs).

Keywords:
angle-to-angleanterior chamber intraocular lensimplantable collamer lenssclera spur-to-sclera spurswept-source optical coherence tomographywhite-to-white

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Area of Science:

  • Ophthalmology
  • Optical Coherence Tomography
  • Biometry

Background:

  • Accurate intraocular lens (IOL) sizing is crucial for optimal refractive outcomes.
  • Existing biometric measurements like white-to-white (WTW) may not fully capture anterior segment anatomy for IOL calculation.
  • Chinese populations may have unique ocular dimensions influencing IOL selection.

Purpose of the Study:

  • To compare iridocorneal angle-to-angle (ATA), sclera spur-to-sclera spur (STS), and white-to-white (WTW) ocular diameters.
  • To evaluate the influence of these diameters on anterior chamber intraocular lens (ACIOL) and implantable collamer lens (ICL) sizing.
  • To assess these measurements in Chinese subjects using swept-source optical coherence tomography (SS-OCT).

Main Methods:

  • Retrospective, observational, cross-sectional study of 60 Chinese subjects.
  • Measurement of ATA, STS, and WTW in six axes using SS-OCT.
  • Calculation of ACIOL and ICL sizes based on anterior segment data; statistical analysis including paired t-tests and Pearson's correlation.

Main Results:

  • ATA and STS were significantly longer in the vertical axis compared to the horizontal axis, while WTW measurements were similar across axes.
  • ATA and STS were wider than WTW in the vertical axis.
  • ICL size calculations showed a significant difference based on horizontal versus vertical axis parameters, unlike ACIOLs; age and axial length showed significant correlations with all measured diameters.

Conclusions:

  • ATA and STS diameters provide a more accurate representation of ocular anatomy for phakic IOL sizing compared to WTW measurements.
  • Vertical ATA and STS measurements are critical for precise ICL and ACIOL sizing, especially in the Chinese population.
  • SS-OCT is a valuable tool for detailed anterior segment biometry, aiding in personalized IOL selection.