Zeiss OPMI Lumera i on floor stand, Instructions For Use Manual

Page: 22 / 178

Version 9.2
Page 22 G-30-1720-en
Safety measures OPMI Lumera
®
i on floor stand
Measures to prevent phototoxic injury
Several papers
1)-5)
dealing with the problem of phototoxicity in ophthalmic
surgery have been published. A comprehensive review of these publications
reveals five aspects of particular concern:
– Illumination characteristics (spectral composition)
– Illumination intensity
– Angle of illumination
– Focus of the light source
– Duration of exposure to light
In the following sections, comments on these aspects are given, as well as a
description of how ZEISS, as a manufacturer, makes allowance for them in its
systems.
Illumination characteristics (spectral composition)
Studies on exposing the eye to light with varying spectral compositions have
been conducted since the early 1950s. These studies suggest that the poten-
tial hazard of phototoxic injury to the patient’s retina can be reduced by
blocking out the blue and ultraviolet light proportion below a wavelength
of 475 nm.
Integrated protection filters For protection of the retina, ZEISS offers the swing-in retina protection filter
(blue barrier filter) and the stationary UV blocking filter as standard features
of the surgical microscope. This reduces not only the exposure of the patient’s
eye to light, but also that of the surgeon.
An important point to note here, however, is that the orange color of the
retina protection filter will inevitably change the perceived color of the light.
For this reason, the surgeon may initially have to get used to the changed
appearance of the anatomical structures.