While the Gemini 810 + 980 diode laser is in use, doctors, system operators, auxiliary staff, patients,
and anyone in the operatory must wear the appropriate safety eyewear that has been designed
for use with the wavelengths of 800 nm and higher that are associated with lasers. Eye protection
must conform to Specification DIN EN207 Annex II of the Directive 89/686/EEC with optical density
of OD+5 for the wavelength range of 800 nm–1000 nm such as NoIR Laser Company filter model CYN.
Nominal Ocular Hazard Distance (NOHD) is the distance from the source of laser emission to the
point where it no longer exceeds its Maximum Permissible Exposure (MPE – highest level of laser
radiation to which a person may be exposed without hazardous effects or adverse biological
changes in the eyes or skin). The Nominal Hazard Zone (NHZ) is the space within which the level of
direct, reflected, or scattered radiation during normal operation exceeds the appropriate MPEs. The
outer limit of the NHZ is equal to the NOHD. The NOHD for persons wearing recommended safety
glasses is shown in Table 1 below.
EYE AND SKIN PROTECTION
Table 1: NOHD (INCHES/CM)
GENERAL SAFETY CONSIDERATIONS
Never point the Laser tip directly at the face, eyes or skin of anyone while emit-
ting energy.
RADIATION
SOURCE
MPE mW
cm
2
1.66 22° (+/- 1°)
104 in
265 cm
1.04 in
2.65 cm
With
Recommend-
ed Eye Protec-
tion
Without Eye
Protection
Divergence
Angle
FIBER OPTIC TIP
(DIRECT)
36
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