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  • Title: The retinal irradiance and spectral properties of the multiport illumination system for vitreous surgery.
    Author: Koch FH, Schmidt HP, Mönks T, Blumenröder SH, Haller A, Steinmetz RL.
    Journal: Am J Ophthalmol; 1993 Oct 15; 116(4):489-96. PubMed ID: 8213981.
    Abstract:
    The multiport illumination system was developed as a fiberoptically illuminated pars plana cannula system for vitreous surgery. The retinal irradiance of the multiport illumination system and several other commonly used endoilluminators (light pipes) measured at 5 mm are comparable, ranging from 94 to 256 mW/cm2. In the actual surgical setting, however, the retinal irradiance of the multiport illumination system is far less (56 mW/cm2) because the end of the fiberoptic cables are fixated in the pars plana 16.5 mm away from the retinal surface. A reduction in the maximal intensity (100%) to 50% reduces the retinal irradiance by approximately two thirds to 3.7 mW/cm2. The light emitted by the multiport illumination system used in conjunction with a long-wave pass filter with a cutoff wavelength of 420 nm reduces the amount of short-wavelength light by one third to about 4% of the overall irradiance.
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