6. Safety
When using the instrument, scrupulously observe all the relevant
accident prevention measures established by law to ensure the
safety of the patient.
It is well established that exposure of the eye to intense light sources
for extended periods of time poses a risk of retinal photic injury. Many
ophthalmic instruments illuminate the eye with intense light. The light
levels on the Keeler Slit Lamp is continuously adjustable from
maximum to zero. In addition there is an infra red filter incorporated in
the illumination system to reduce IR light levels.
No visible retinal lesions have been identified as a result of using
Keeler Slit Lamps, however young children and persons with diseased
eyes may be at a higher risk. The risk may also be slightly increased if
the person being examined has had any exposure with the same
instrument or an other ophthalmic instrument using an intense visible
light source during the previous 24 hours. This will apply particularly if
the eye has been subjected to retinal photography.
Caution.
The light emitted from this instrument is
potentially
hazardous. The longer the duration of exposure, the greater the risk
of ocular damage. Exposure to light from this instrument when
operated at maximum intensity will exceed the safety guideline after
44 minutes.
Figure 1: Relative spectral output of PSL
Quantity
Measured
Group 2
Pass/Fail
Comments
Value
limit
Group 2
E
ir-cl
54.82 mW cm
-2
100 mW cm
-2
Pass
-
L
38.0 mW sr
-1
cm
-2
10 J cm
-2
Pass with
Exposure
A-r
exposure
limit 44
limit
minutes
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