HEINE OMEGA 500 Manual De Instrucciones página 7

Operation OMEGA 500 Headband
Selecting the position of the optics overband
The overband (4) swivels and can be fixed into the following positions
by means of the position lock (5) (upwards for the rest position, down
for working positions 1 or 2). To release the overband, press the
position lock control (5) and rotate it. Do not try to force the overband
up or down. With practice a comfortable working position can be
selected and, when properly adjusted, the optics unit will always
return to the desired working position.
Fitting the headband rheostat HC 50 L
When fitting, ensure that the guide pin (15) of the headband rheostat
HC 50 L (14) locates correctly in the opening (16) of the overband (4).
Locate the connecting cord between the power source and the head-
band rheostat in the cord clip (21) at the back of the headband.
Fitting the position control
Before fitting the position control (5) ensure that the positioning plate
(19) is swiveled upwards as far as possible. To do this, press the
positioning plate (19) and swivel it upwards simultaneously. Ensure
that the optics overband is in the lower position and that the guide pin
(20) locates in the opening (16). Now press the position control (5) on
to the guide (17) until it clicks into placed.
Removing the headband rheostat HC 50 L and position control
The control of the HC 50 L (14) and the position control (5) can be
fitted on the right- or left-hand side of the headband according to
preference. To remove, press the release (18) and pull the control
off the headband.
Adjusting the optics
Unscrew the control (2) so that the optics unit (3) is free to move.
(The position of this control can be reversed for left-handed operation
if required). Place the instrument on your head and adjust the height
and circumference by means of the adjusters (22) and (1) until a com-
fortable fit is achieved. The rear part of the headband can be pivoted
and is self-latching. Adjust the optics to a position as close as possible
to your eyes and view the light spot at a distance of about 30 – 40 cm
without accommodating. A small, pencilsized object should be
sharply-focused (the eyepieces incorporate 2D lenses. Spectacle
wearers should examine through the "far" part of the spectacle
lens). Adjust the optics unit so that the light spot appears centered
vertically in position of the headband or to choose an alternative
working position by pressing your view and screw the adjuster knob
in (2). (It may be necessary to correct the lever (5) and swiveling
the optics overband into a different position. If the light spot needs
horizontal adjustment, simply rotate the headband slightly to the
side. Adjust and fine-tune the PD setting by closing first one then the
other eye and observing an object in the middle of the light spot while
adjusting the appropriate eyepiece. Repeat until the object is in the
middle of the field of view, and a single image is obtained. Take off
the instrument and check that the PD is symmetrically adjusted.
If not, repeat the selection procedure as above. Correct adjustment
of PD is particularly important when examining through a small pupil.
Each user should adjust the setting to match his-own PD. Every
instrument includes two plano lenses, which can be exchanged
for the 2D lenses which are fitted as standard equipment. Always
use the OMEGA 500 with plano or the 2D lenses. Make sure that
you change the plano lenses under clean conditions to avoid that
particles enter the optics.
Operation OMEGA 500
Basic Adjustments
Switch the instrument on by means of the rotary knob (brightness
control) on the HC 50 L brightness controller. Aperture wheel (7) and
filter wheel (6) should be rotated upwards to select the large aperture
with white light. Control (11) should be in the middle position. The
beam control (9) should be in the mid-position. Slide the eyepieces
into position to match your P.D. or select the mid-position on the
scale.
Setting the brightness
Adjust the brightness using the HC 50 L (14) brightness controller
or the connected power source.
If you use OMEGA 500 with LED, please adjust a slightly higher
brightness initially and reduce the brightness afterwards.
Control Locks
The aperture (7) and filter controls (6) can be locked into position by
means of the lock (8) to avoid unintentional operation.
Aperture Control
3 different aperture sizes and a diffuser aperture can be selected by
means of the aperture control (7). The choice of aperture depends
mainly on the size of the patient's pupil. The diffuser is useful for
photophobic patients and the examination of the periphery.
Filter Control
The filter control (6) can be used to select an interference red-free
filter, a blue or a yellow filter which can be introduced into the
illumination beam.
Synchronized adjustment of Convergence and Parallax
This feature ensures the best possible stereopsis and image quality
for any pupil size by simultaneous adjustment of the observation
and illumination beams. For a dilated pupil, move the control (11)
underneath the instrument to the large circle position. For a small
pupil, move the control to the small circle position. The control (11)
can be positioned anywhere between these two settings to select the
optimum parallax and stereopsis (convergence) for any pupil size.
The illumination beam can be adjusted vertically by the control (9).
Teaching Mirror
The optional teaching mirror can be slid onto the fixture (10) of the
optics.
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