Iridex IQ 577 - Page 37

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/πMPE)
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.