Anterior segment structure changes caused by different luminance light after implantable collamer lens surgery

Area of Science:

• Ophthalmology
• Optometry
• Biomedical Engineering

Background:

• Investigating anterior eye segment changes after implantable collamer lens (ICL) implantation.
• Assessing the impact of mesopic and photopic lighting conditions on ocular structures.

Purpose of the Study:

• To analyze alterations in the anterior eye segment of myopic patients post-ICL V4c surgery.
• To evaluate the effects of varying light intensities (mesopic vs. photopic) on ICL vault, pupil diameter, and anterior chamber dimensions.

Main Methods:

• Utilized anterior segment optical coherence tomography (AS-OCT) to measure ocular parameters.
• Included 47 eyes of myopic patients three months after ICL V4c implantation.
• Recorded measurements under both mesopic (0 lx) and photopic (5290 lx) conditions.

Main Results:

• Photopic conditions led to a significant decrease in vault (486.7 ± 186.1 μm) compared to mesopic conditions (643.5 ± 191.2 μm).
• Anterior chamber depth-ICL (ACD-ICL) significantly increased in photopic light (2.54 ± 0.24 mm vs. 2.37 ± 0.23 mm).
• Pupil diameter significantly constricted under photopic conditions (2.66 ± 0.23 mm vs. 5.62 ± 0.55 mm), while ACD remained unchanged.

Conclusions:

• Post-ICL surgery, increased light intensity causes pupil constriction, reduced vault, widened anterior chamber angle, and increased ACD-ICL.
• Observed ocular changes are attributed to iris dynamics, not alterations in the crystalline lens.
• These findings are crucial for understanding visual performance and potential complications after ICL implantation.