Keeler Slit Lamp H Series, Инструкция по эксплуатации

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S L I T L A M P b y K E E L E R www.keeler.co.uk
5 brief deScription of the inStrument 6 Safety
6.1 photo toxicity
Because prolonged intense light exposure can damage
the retina, the use of the device for ocular examination
should not be unnecessarily prolonged, and the
brightness setting should not exceed what is needed to
provide clear visualization of the target structures. This device should be used
with filters that eliminate UV radiation (< 400 nm) and, whenever possible,
filters that eliminate short-wavelength blue light (<420 nm).
The retinal exposure dose for a photochemical hazard is a product of the
radiance and the exposure time. If the value of radiance were reduced in half,
twice the time would be needed to reach the maximum exposure limit.
While no acute optical radiation hazards have been identified for slit lamps,
it is recommended that the intensity of light directed into the patient’s eye
be limited to the minimum level which is necessary for diagnosis. Infants,
aphakes and persons with diseased eyes will be at greater risk. The risk may
also be increased if the person being examined has had any exposure with
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.
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/ ocular damage .
Many ophthalmic instruments illuminate the eye with intense light. The
light intensity 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.
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 a period of 13 minutes
when using the ancillary 90D lens and 45 minutes when not.
Keeler Ltd shall on request, provide the user with a graph showing the
relative spectral output of the instrument