Canon CF-1 User Manual
Page 5
Safety Information
-5-
According to the American Conference of Governmental Industrial Hygienist (ACGIH) -
Threshold Limit Values for Chemical Substances and Physical Agents (1995 - 1996 edition),
at photochemical radiances La and Lb of 80 [mW/cm²/sr], 3 minutes irradiation would cause
the retinal exposure dose level to attain the recommended exposure limit.
If the value of radiance was 40 [mW/cm²/sr], 6 minutes would be needed to reach the recom-
mended limit.
That is, the retinal exposure dose for a photochemical hazard is a product of the radiance and
the exposure time.
Since La and Lb of this instrument are extremely low, the risk of the photochemical hazard is
also very low. While no acute optical radiation hazards have been identified for this instru-
ment, it is recommended that the intensity of light directed into the examinee’s eye be limited
to the minimum level which is necessary for diagnosis. Infants, aphakes and persons with dis-
eased eyes will be at greater risk. The risk may also be increased if the person being exam-
ined has had any exposure to the same instrument or any other ophthalmic instrument using a
visible light source during the previous 24 hours. This will apply particularly if the eye has been
exposed to retinal photography.
000_L-IE-5152E_CF-1.book Page 5 Monday, July 29, 2013 10:30 AM