Value of preoperative phakic intraocular lens simulation using optical coherence tomography

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optical Coherence Tomography

Background:

• Iris-fixated phakic intraocular lenses (pIOLs) are used for refractive correction.
• Accurate preoperative planning is crucial for pIOL safety and efficacy.
• Anterior segment optical coherence tomography (AS-OCT) allows detailed visualization of anterior chamber structures.

Purpose of the Study:

• To compare the predicted position of iris-fixated pIOLs from preoperative simulations with their actual postoperative positions.
• To evaluate the accuracy of AS-OCT in assessing pIOL placement.
• To determine the clinical relevance of any discrepancies between simulated and actual pIOL positions.

Main Methods:

• Prospective study analyzing anterior chamber morphometrics using preoperative pIOL simulation and postoperative AS-OCT imaging.
• Measurements included distances from pIOL center/edge to endothelium and from pIOL to crystalline lens.
• Data collected before and 6 months after pIOL implantation in 34 eyes (18 patients).

Main Results:

• High correlations and small mean differences were observed between preoperative simulations and postoperative measurements for most parameters.
• Statistically significant differences were found for the nasal edge of the pIOL to endothelium distance (P=.045) and pIOL to crystalline lens distance (P=.001).
• The range of agreement between simulation and postoperative measurements was 0.24–0.29 mm.

Conclusions:

• Preoperative simulation is a valuable tool for patient selection and ensuring the long-term safety of pIOLs.
• Clinicians must acknowledge the potential range of differences between simulated and actual postoperative pIOL positions.
• AS-OCT provides reliable postoperative assessment of pIOL placement.