Worst-Fechner biconcave minus power phakic iris-claw lens

Area of Science:

• Ophthalmology
• Refractive Surgery
• Biomedical Engineering

Background:

• High myopia presents significant visual challenges.
• Phakic intraocular lenses (IOLs) offer a surgical correction option.
• The Worst-Fechner biconcave minus power iris-claw lens was used for phakic eye implantation.

Purpose of the Study:

• To evaluate the long-term efficacy and safety of the Worst-Fechner iris-claw lens for high myopia correction.
• To assess refractive outcomes and corneal endothelial cell density changes post-implantation.

Main Methods:

• Implantation of 127 phakic IOLs in 70 patients with high myopia (mean spherical equivalent -14.29 D).
• Follow-up examinations up to 8 years, assessing refractive error and visual acuity.
• Corneal endothelial density estimation using specular microscopy and the Karickhoff method.

Main Results:

• Achieved refractive correction within +/- 1.00 D in 75% of eyes.
• Spectacle-corrected visual acuity improved postoperatively but decreased by year 8.
• Significant correlation between endothelial cell loss and patient age, anterior chamber depth, and IOL power.

Conclusions:

• The Worst-Fechner lens effectively corrected high myopia with stable refractive results.
• A significant progressive reduction in endothelial cell density occurred in 13.4% of eyes.
• This lens design is no longer in clinical use due to safety concerns.