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A contralateral eye study comparing apodized diffractive and full diffractive lenses: wavefront analysis and distance
Marcony Rodrigues de Santhiago1, Marcelo Vieira Netto, Jackson Barreto
1Department of Cataract Surgery, Universidade de São Paulo, São Paulo, SP, Brazil. marconysanthiago@hotmail.com
Clinics (Sao Paulo, Brazil)
|October 21, 2009
Summary
This study compared two multifocal intraocular lenses (IOLs), finding similar visual acuity for both ReSTOR and Tecnis IOLs. The Tecnis IOL showed lower spherical aberration, but both IOLs demonstrated comparable modulation transfer functions.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Optics
Background:
- Cataract surgery often involves intraocular lens (IOL) implantation to restore vision.
- Multifocal IOLs aim to provide clear vision at multiple distances, but their performance can vary.
- Diffractive multifocal IOLs are a common type used to achieve spectacle independence.
Purpose of the Study:
- To compare the visual acuity, wavefront errors, and modulation transfer functions of two diffractive multifocal intraocular lenses.
- To evaluate the intraindividual performance of the ReSTOR SN60D3 and Tecnis ZM900 IOLs.
- To assess visual outcomes and optical quality after cataract surgery with different multifocal IOLs.
Main Methods:
- A prospective study involving 40 eyes of 20 cataract patients.
- Phacoemulsification with implantation of a ReSTOR IOL in one eye and a Tecnis ZM900 IOL in the contralateral eye.
- Evaluation of uncorrected visual acuity (UCVA) at distance and near, defocus curves, wavefront errors, and modulation transfer functions over a 3-month follow-up.
Main Results:
- Both ReSTOR and Tecnis IOLs provided similar mean photopic distance and near UCVA at 3 months postoperatively.
- Defocus curves indicated good visual performance between focal points for both IOL groups.
- While total, higher-order, and coma aberrations were similar, the Tecnis IOL exhibited significantly lower spherical aberration compared to the ReSTOR IOL (p=0.004).
- Modulation transfer functions were comparable between the two IOL groups.
Conclusions:
- The ReSTOR SN60D3 and Tecnis ZM900 diffractive multifocal IOLs offer comparable distance and near visual acuity.
- Both IOLs demonstrated favorable optical quality with low aberrations.
- The Tecnis ZM900 IOL showed a statistically significant reduction in spherical aberration compared to the ReSTOR SN60D3 IOL, with similar modulation transfer functions observed for both.
