Predicting the postoperative intraocular lens position using continuous intraoperative optical coherence tomography...

Area of Science:

• Ophthalmology
• Medical Imaging
• Surgical Technology

Background:

• Accurate intraocular lens (IOL) position prediction is crucial for successful cataract surgery and optimal visual outcomes.
• Current methods relying on preoperative measurements have limitations in predicting postoperative IOL alignment.
• The anterior chamber depth (ACD) is a key parameter influenced by lens capsule position.

Purpose of the Study:

• To evaluate the utility of continuous intraoperative optical coherence tomography (OCT) for measuring lens capsule position during cataract surgery.
• To determine if intraoperative OCT measurements can improve the prediction of the final intraocular lens (IOL) position.
• To compare the predictive value of intraoperative capsule measurements with traditional preoperative ACD measurements.

Main Methods:

• A prospective study involving 70 patients undergoing cataract surgery.
• Utilized a prototype operating microscope with integrated continuous OCT to measure anterior and posterior lens capsule positions intraoperatively.
• Capsular tension rings (CTRs) were used to stabilize the lens capsule.
• Anterior chamber depth (ACD) was measured preoperatively and postoperatively using partial coherence interferometry.
• Partial least squares regression (PLSR) analyzed the influence of various parameters on IOL position.

Main Results:

• Intraoperative measurements of the anterior lens capsule, particularly after crystalline lens removal and CTR insertion, were significant predictors of postoperative ACD.
• These intraoperative capsule measurements demonstrated superior predictive capability for postoperative ACD compared to preoperative ACD measurements.
• The study included patients with a mean axial eye length of 23.6 mm and mean IOL power of 22.2 diopters.

Conclusions:

• Intraoperative measurement of lens capsule position using continuous OCT offers a promising approach to enhance the accuracy of IOL power calculations.
• This technique may help overcome the challenge of predicting postoperative IOL position, a known limitation in current refractive cataract surgery.
• Replacing preoperative ACD measurements with intraoperative lens capsule data could lead to more predictable refractive outcomes after cataract surgery.