15510-EN Rev G
Safety and Compliance 33
The following formula was used to calculate the most conservative NOHD values:
NOHD = (1.7/NA)(
Φ
/
π
MPE)
0.5
where:
NOHD = the distance, in meters, at which the beam irradiance equals the appropriate
corneal MPE
NA = the numerical aperture of the beam emerging from the optical fiber
Φ
= the maximum possible laser power, in watts
MPE = the level of laser radiation, in W/m
2
, to which a person may be exposed without
suffering adverse events
Numerical aperture is equal to the sine of the half-angle of the emerging laser beam. Maximum
available laser power and associated NA vary with each delivery device, resulting in unique NOHD
values for each delivery device.
NOTE: Not all delivery devices are available for all laser models.
IQ 577/IQ 532 NOHD Values for Various Delivery Devices
Delivery Device
MPE
(W/m
2
)
Numerical
Aperture
(NA)
Maximum
Power
Φ
(W)
NOHD
(m)
EndoProbe
10
0.100
2.000
4.3
Oto/ENT Probes (IQ 532)
10
0.100
2.500
4.8
Oto/ENT Probes (IQ 532 with XP option)
10
0.100
6.000
7.4
Laser Indirect Ophthalmoscope (LIO)
10
0.013
2.000
33.0
Slit Lamp Adapter (SLA)
10
0.012
1.800
33.9
Optical density of laser safety glasses used with IQ 577 (maximum output power of 2 W) should have
an OD
≥
4 at 577 nm.
Optical density of laser safety glasses used with IQ 532 (maximum output power of 2.5 W) should
have an OD
≥
4 at 532 nm.
Optical density of laser safety glasses used with IQ 532 (maximum output power of 6 W) should have
an OD
≥
4.2 at 532 nm.
Содержание IQ 532
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