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A new objective cataract grading method using swept-source optical coherence tomography (SS-OCT) lens densitometry is repeatable and reliable. This method shows strong correlation with visual impairment, aiding in cataract surgery discussions.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biomedical Optics

Background:

  • Cataract grading is crucial for surgical decision-making.
  • Objective and reliable methods for cataract assessment are needed.
  • Swept-source optical coherence tomography (SS-OCT) offers high-resolution imaging of the ocular lens.

Purpose of the Study:

  • To evaluate a novel objective cataract grading technique.
  • To assess lens densitometry measurements from SS-OCT scans.
  • To validate this method against established cataract assessment tools.

Main Methods:

  • A prospective case series included 110 eyes (51 cataract, 59 controls).
  • Lens densitometry was measured using SS-OCT (IOLMaster 700) and ImageJ software.
  • Comparisons were made with ocular scatter index (OSI) and nuclear staging scores.

Main Results:

  • Average lens densitometry measurements were highly repeatable (P=.99).
  • Lens density correlated significantly with OSI (r²=0.52) and nuclear staging (r²=0.75).
  • A cutoff of 82.9 pixel units demonstrated 73.9% sensitivity and 91.2% specificity for cataract detection.

Conclusions:

  • SS-OCT-derived lens densitometry provides a repeatable and reliable objective method for cataract grading.
  • This objective measure correlates well with existing clinical assessments.
  • The method can aid in discussing cataract surgery when combined with patient-reported visual impairment.