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C. Huang, J. Caspar; Effect of Multifocal Apodized Diffractive Intraocular Lenses on Ophthalmic Lasers. Invest. Ophthalmol. Vis. Sci. 2007;48(13):3118.
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© ARVO (1962-2015); The Authors (2016-present)
To compare laser spot size generated by ophthalmic lasers through a multifocal apodized ReSTOR intraocular lens and a standard monofocal intraocular lens.
An experimental optical bench was constructed using an intraocular lens (IOL) mount attached to an adjustable rail. A laser beam of 635nm in wavelength was directed through either a SN60AT monofocal IOL or a multifocal apodized ReSTOR IOL of similar power. The laser beam was focused into the sensor of a digital camera and the resulting images were captured. The resulting laser beam spot size and intensity were derived from these digital images, and a comparison was made between images produced by a SN60AT IOL and a ReSTOR IOL. Several variables were analyzed to assess their effect on the resulting laser beam spot size. These variables included the intensity, duration and size of the laser beam as well as the position of the incoming laser beam relative to the center of the tested IOL.
The ReSTOR IOL produced larger laser spot sizes when compared to monofocal IOL. The difference in laser spot size between the IOLs is dependent on laser beam size, intensity and duration. This difference is greater with increasing laser intensity, longer duration and a beam size of 100 and 200 microns. The laser spot size generated by the ReSTOR IOL varies depending on where the incoming laser beam hits the IOL. This variation in laser spot size is greater with larger laser beam sizes.
The ReSTOR IOL creates larger laser spot sizes due to the effect of its apodized rings. Performing retinal laser through a ReSTOR IOL may cause the laser spot sizes to be larger than expected, especially when increasing the intensity or duration of the laser. This may have greater clinical significance when performing macular laser or laser that requires a long beam duration as in the case of photodynamic therapy laser. These results help to improve our understanding of the clinical effect of increased halos reported by patients with multifocal IOLs. In vivo data is needed to obtain the true difference in spot size created by the ReSTOR lens.
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