Zeiss opmi lumera 700, Instructions For Use Manual, Page: 24 / 236

2 Safety notes Instructions for Use
OPMI LUMERA 700 2.7 Measures to prevent phototoxic injury
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If you are not using the device, switch it off at the power
switch.
Hazards arising from inadequate sanitation
Insufficient, incorrect or wrong cleaning or disinfection that does
not comply with these Instructions for Use can expose the patient
or medical staff to a considerable risk of infection.
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Follow the instructions in "Cleaning and disinfection [
}
177]".
2.7 Measures to prevent phototoxic injury
There are multiple publications [ } 28]
1-5)
that deal with the issue of
phototoxicity in eye surgeries. They list five aspects of particular
concern:
• Illumination characteristics (spectral composition)
• Illumination intensity
• Angle of illumination
• Focus of the light source
• Exposure time to light
In the following, comments on these aspects are given and a
description of how ZEISS, as a manufacturer, makes allowance for
them in its systems.
2.7.1 Illumination characteristics (spectral composition)
Studies on exposing the eye to light with varying spectral composi-
tions have been conducted since as early as the 1950s. These
studies suggest that the potential hazard of phototoxic injury to the
patient's retina can be reduced by blocking out the blue and ultra-
violet light 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.
The retina protection filter's orange color changes the color of the
light. The physician must become accustomed to working with the
altered appearance of the anatomical structures.
2.7.2 Illumination intensity
The majority of researchers suggest that the surgeon should use
the lowest light intensity required on the patient's eye to guarantee
optimal viewing during surgery.