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Surface scattering in implanted hydrophobic intraocular lenses
Hitoshi Nishihara1, Shigeo Yaguchi, Takeo Onishi
1Department of Ophthalmology, Showa University Fujigaoka Hospital, Yokohama, Kanagawa, Japan. hnishi_fujig@hotmail.com
Journal of Cataract and Refractive Surgery
|August 6, 2003
Summary
Surface scattering in acrylic intraocular lenses (IOLs) was observed, potentially caused by phase separation of water within the hydrophobic material. Newer IOLs show reduced scattering without impacting visual performance.
Area of Science:
- Ophthalmology
- Materials Science
Background:
- Surface scattering is a newly identified phenomenon in polyacrylic intraocular lenses (IOLs).
- Understanding the cause of this scattering is crucial for IOL development and patient outcomes.
Purpose of the Study:
- To describe the phenomenon of surface scattering in AcrySof(R) intraocular lenses (IOLs).
- To investigate the potential causes of this surface scattering.
- To compare scattering in IOLs implanted in different years.
Main Methods:
- Observational case series of 40 patients receiving AcrySof(R) IOLs.
- Evaluation of lens surface scattering using Scheimpflug photography and area densitometry.
- Comparison of IOLs implanted in 1991 with those implanted in 1999.
Main Results:
- Surface scattering was observed in IOLs implanted in 1991, with greater degrees noted compared to the 1999 group.
- No degradation in visual performance or adverse effects were observed in either patient group.
- Neodymium:YAG (Nd:YAG) laser treatment was unsuccessful in removing the scattering, suggesting it is not foreign material deposition.
Conclusions:
- Surface scattering appears to originate in the near-surface layer of the IOL, not from foreign material deposition.
- Phase separation of water within the hydrophobic IOL material is a likely cause.
- Recent AcrySof(R) IOLs exhibit reduced surface scattering.