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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Accurate sizing of implantable collamer lenses (ICLs) is crucial for optimal refractive outcomes and preventing complications.
  • Current sizing methods, like the STAAR nomogram, may not always provide precise vault prediction.
  • Anterior segment optical coherence tomography (AS-OCT) offers detailed anterior segment measurements.

Purpose of the Study:

  • To develop and validate a novel formula (NK-formula) for determining ICL size using AS-OCT parameters.
  • To compare the accuracy of the NK-formula with the existing STAAR nomogram in predicting postoperative vault height.

Main Methods:

  • An interventional case series involving 46 eyes of 23 patients undergoing ICL implantation.
  • Preoperative anterior segment parameters were measured using high-frequency ultrasound biomicroscopy and AS-OCT.
  • Stepwise multiple regression analysis was used to derive the NK-formula based on optimal ICL size and AS-OCT parameters (ACW, CLR).

Main Results:

  • The NK-formula incorporated the distance between scleral spurs (ACW) and crystalline lens rise (CLR) as significant predictors (R² = 0.68, P < .05).
  • The NK-formula resulted in a significantly lower mean absolute error in vault prediction (0.190 ± 0.129 mm) compared to the STAAR nomogram (0.331 ± 0.235 mm, P = .002).
  • Using the NK-formula, 71% of eyes achieved a moderate vault, comparable to the STAAR nomogram's 69%.

Conclusions:

  • AS-OCT is a valuable tool for ICL size determination due to its automated analysis of anterior segment parameters.
  • The NK-formula demonstrates superior accuracy in predicting postoperative vault height compared to the conventional STAAR nomogram.
  • This enhanced accuracy may lead to improved ICL sizing and better patient outcomes.