Image Contrast and Spectral Transmission in Intraocular Lenses with Nd:YAG Pits
A F Borkenstein1, E M Borkenstein1, P Omidi2
1Borkenstein & Borkenstein Private Practice, Privatklinik der Kreuzschwestern Graz, Graz, Austria.
Current Eye Research
|June 29, 2023
Summary
Neodymium yttrium aluminum garnet (Nd:YAG) laser capsulotomy can cause YAG-pits in intraocular lenses (IOLs). These pits significantly reduce image contrast and light transmission, potentially impacting visual quality after cataract surgery.
Area of Science:
- Ophthalmology
- Biomedical Optics
- Materials Science
Background:
- Neodymium yttrium aluminum garnet (Nd:YAG) laser capsulotomy is a common procedure for posterior capsule opacification.
- Potential side effects, such as YAG-pits, can arise from incorrect laser focus during the procedure.
Purpose of the Study:
- To evaluate the impact of YAG-pits on intraocular lens (IOL) image performance.
- To measure spectral transmission and analyze image contrast changes caused by YAG-pits.
Main Methods:
- Acrylic, foldable, one-piece IOLs (monofocal and enhanced monofocal) were studied.
- YAG-pits were intentionally created in the IOLs using a photodisruption laser.
- Measurements included surface topography, USAF resolution tests, spectral transmittance, and through-focus contrast.
Main Results:
- YAG-pits significantly decreased image contrast (up to 62%) and spectral transmission (up to 57%).
- A reduction in total transmitted light intensity was observed between 450-700 nm wavelengths.
- USAF test target results were notably worse in IOLs with YAG-pits compared to unaltered lenses.
Conclusions:
- YAG-pits demonstrably deteriorate IOL image performance, reducing contrast and light transmittance.
- No systematic differences were found between monofocal and enhanced monofocal IOLs regarding YAG-pit impact.
- Further research is recommended to investigate the effects on diffractive IOLs.
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