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Agreement between 2 swept-source OCT biometers and a Scheimpflug partial coherence interferometer.

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This study compared three optical biometers for eye measurements. While keratometry readings agreed, significant differences were found in axial length and other parameters, impacting device interchangeability.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optical Metrology

Background:

  • Accurate ocular biometry is crucial for refractive surgery outcomes.
  • Comparing different biometry devices is essential for clinical practice and research.
  • Swept-source optical coherence tomography (SS-OCT) and Scheimpflug imaging are advanced biometry technologies.

Purpose of the Study:

  • To evaluate the agreement between parameters obtained from two SS-OCT biometers (ANTERION, IOLMaster 700) and one Scheimpflug camera with partial coherence interferometry (PCI) (Pentacam AXL).
  • To assess the clinical interchangeability of these widely used ophthalmic biometry devices.

Main Methods:

  • A prospective case series involving 49 eyes.
  • Measurements included keratometry (K), J0/J45 vectors, anterior chamber depth (ACD), central corneal thickness (CCT), white-to-white (WTW), lens thickness (LT), and axial length (AL).
  • Bland-Altman analysis was used to compare data from ANTERION SS-OCT, IOLMaster 700 SS-OCT, and Pentacam AXL PCI.

Main Results:

  • No significant differences were found in keratometry (K1, K2) or J0/J45 vectors between the three devices.
  • Statistically significant differences (P < .001) were observed for ACD, CCT, WTW, LT, and AL.
  • Specific differences noted: IOLMaster 700 yielded the shortest ACD and highest CCT; Pentacam AXL had the shortest WTW; IOLMaster 700 showed a shorter AL compared to Pentacam AXL.

Conclusions:

  • While keratometry readings are comparable, significant variations exist in other biometric parameters among the evaluated devices.
  • Clinical judgment is required to interpret mean differences and limits of agreement for parameter interchangeability.
  • These findings highlight the need for careful consideration when switching between biometry devices in clinical practice.