Determining and Comparing the Effective Lens Position and Refractive Outcome of a Novel Rhexis-Fixated Lens to...

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optics

Background:

• Cataract surgery involves implanting intraocular lenses (IOLs) to restore vision.
• Accurate prediction of postoperative refraction is crucial for visual outcomes.
• Effective lens position (ELP) is a key factor in refractive prediction models.

Purpose of the Study:

• To compare the effective lens position (ELP) among different intraocular lens (IOL) designs.
• To evaluate the impact of IOL design on refractive prediction accuracy.

Main Methods:

• A retrospective, multicenter comparative case series.
• Included patients undergoing cataract surgery with plate-haptic, c-loop haptic, or rhexis-fixated IOL implantation.
• Biometry and refraction measurements were taken preoperatively and 3 months postoperatively.

Main Results:

• Rhexis-fixated IOLs demonstrated the shortest ELP (4.29 ± 0.24 mm), followed by c-loop haptic (4.41 ± 0.42 mm) and plate-haptic (4.51 ± 0.26 mm) IOLs.
• Significant differences in ELP were observed between rhexis-fixated IOLs and both plate-haptic (P = .001) and c-loop haptic IOLs (P = .000).
• Anterior chamber depth adjustments based on lens design significantly affected refraction and IOL power predictions across all formulas and lenses (P < .05).

Conclusions:

• IOL fixation method and resulting position within the capsular bag significantly influence ELP.
• These variations in ELP have a consequential impact on the accuracy of postoperative refraction predictions.