Zeiss opmi lumera 700, Instructions For Use Manual, Page: 26 / 236

2 Safety notes Instructions for Use
OPMI LUMERA 700 2.7 Measures to prevent phototoxic injury
26 / 236 G-30-1673-en - 14.0 - 2018-07-12
Phototoxic risk factors
The microscope light source—like any bright light source—may
present a potential hazard to the patient’s eye both in the form of
immediately visible thermal damage to the retina as well as photo-
toxic chemical reactions which may lead to photoretinitis. The
factors which play an important role in determining the phototoxic
risk are:
• Lamp brightness
• Spectral distribution of the light (UV and blue light are more
dangerous than longer wavelengths)
• Duration of direct exposure
• Pupil size
• Clarity of ocular media (infants and young children, for
example, may be at a higher risk)
• Condition of the eye (aphakic and pseudo-aphakic eyes with
IOLs of a material without UV / blue filter are at a higher risk)
• Previous exposure to bright light (such as retinal photography,
especially within the last 24 hours)
During cataract procedures, exposure is interrupted by the
following factors:
• Lens material
• Phaco handpiece
• Eye movement
This is expected to significantly lengthen the time before photore-
tinitis might be expected to occur.
Effects of microscope illumination
A prospective study [
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29]
7)
of the effects of microscope illumi-
nation during surgery did not reveal any phototoxic retinal injuries
for procedure times of up to 30 minutes if the calculated maximum
recommended exposure time was 150 seconds. The prospective
study also found that, at the same brightness setting, phototoxic
retinal injury could be expected after operations with a duration of
approximately 100 min.
Stereo Coaxial Illumination (SCI)
The Stereo Coaxial Illumination of this device has been designed to
provide a bright red reflex using only very small quantities of light
in the center of the surgical field.
The peripheral illumination causes higher exposure of the retina,
but, depending on the position of the eye, usually not the macula
directly. In order to reduce the risk of phototoxicity during cataract
operations, ZEISS recommends taking the following measures: