title: The retinal irradiance and spectral properties of the multiport illumination system for vitreous surgery.
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.
authors.affiliation: Department of Ophthalmology, University of Bonn, Germany.
authors.forename: F H
authors.initials: FH
authors.lastname: Koch
authors.forename: H P
authors.initials: HP
authors.lastname: Schmidt
authors.forename: T
authors.initials: T
authors.lastname: Mönks
authors.forename: S H
authors.initials: SH
authors.lastname: Blumenröder
authors.forename: A
authors.initials: A
authors.lastname: Haller
authors.forename: R L
authors.initials: RL
authors.lastname: Steinmetz
mesh_terms: D005128:Eye Diseases / Q000601:surgery; D005336:Fiber Optic Technology / Q000295:instrumentation; D006801:Humans; D008029:Lighting / Q000009:adverse effects / Q000379:methods*; D009885:Ophthalmology / Q000295:instrumentation*; D011832:Radiation Injuries; D012160:Retina / Q000293:injuries / Q000502:physiology*; D012684:Sensory Thresholds; D013523:Surgical Equipment; D014822:Vitreous Body / Q000601:surgery*