Assessment Of Changes In Anterior Chamber Dimensions Following Phakic Intracollamer Lens (Icl) Implantation Using High-Resolution Anterior Segment Optical Coherence Tomography And Scheimpflug Imaging

The primary purpose of this study was to predict who is at risk of developing narrow angles after ICL implantation using both high-resolution anterior chamber optical coherence tomography  (AS-OCT) and corneal tomography (Pentacam) and modify the ICL size accordingly. 

This retrospective study was conducted at King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia.

Patients who have undergone ICL implantation with preoperative and postoperative images of either modality: AS-OCT or Pentacam, were included in the study. The preoperative parameters of each modality were compared to the Anterior chamber depth and angle dimensions postoperatively.

Out of 106 eyes included, one patient experienced high intraocular pressure one day postoperatively due to viscoelastic retention and managed by urgent anterior chamber washout in the operating room. There was a statistically significant change in the anterior chamber angle measured by Pentacam after ICL implantation (25.1±3.9) compared to preoperative test results (39.2±8.0) (p-value<0.0001). A similar reduction was observed in anterior chamber depth (ACD) (preoperative ACD =3.2±0.2 vs. postoperative ACD= 3.1±0.2) (P-value=0.0006). Parameters taken from AS-OCT, such as tubercular iris space area (TISA) and angle opening distance (AOD), showed significant reduction after ICL implantation compared to preoperative readings (P-value<0.0001). 

ICL implantation in our population was associated with a reduction of anterior chamber dimensions. This reduction did not increase the risk of secondary complications such as secondary angle closure glaucoma.