Welch Allyn PanOptic 118 Series - Page 7

3
mum intensity and maximum aperture. Values of LB or LA over
17.50 mW/(cm2*sr) are considered high.
The retinal exposure dose for a photochemical hazard is a product
of the radiance and the exposure time. For instance, at a radiance
level of 17.50 mW/(cm2*sr), a 3-minute exposure would produce a
retinal exposure dose level at the recommended limit. If the value
of radiance were reduced to 8.75 mW/(cm2*sr), twice that time (i.e.
6 minutes) is needed to reach the recommended limit. The
recommended exposure dose is based on calculations using the
American Conference of Governmental Industrial Hygienists
(ACGIH) Threshold Limit Values for Chemical Substances and
Physical Agents (2000 edition).
The 118 Series Ophthalmoscope has spectrally weighted
photochemical radiances at maximum intensity and
maximum aperture of .287 mW/(cm
2
*sr) for L
B
and.306
mW/(cm
2
*sr) for L
A
(aphake). The relative spectral output of
the device is shown on page 3.
Welch Allyn 118 Series Ophthalmoscope
300 345 390 435 480 525 570 615 660 705 750 795 840 885 930 975
1020 1065
Wavelength (nm)
Relative Spectral Irradiance
(W/cm^2)