HEINE OMEGA 500 Guia De Inicio Rapido página 4

HEINE OMEGA 500 operation
®
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.
Dynamic range lever (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:
If you use OMEGA 500 with LED, please adjust a slightly higher brightness
initially and reduce the brightness afterwards. The low edge of the HC 50 L
ramp indicates ca. 1/3 of the maximum setting range. The high end of the
rd
ramp indicates ca. 2/3 of the maximum setting range. 1 indicates the maxi-
rd
mum of the setting range and 0 indicates the minimum.
Control Locks:
The aperture and filter controls 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.
4/20
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 Dynamic range lever (11) underneath
the instrument to the large circle position. For a small pupil, move the control
to the small circle position. The Dynamic range lever (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.
Changing the bulb:
First allow the instrument to cool down.
Disconnect the instrument from the power source.
Unscrew the control (2) so that the optics unit (3) is free to move. Slide the
bulb cover (12) upwards. Do not pull on the cord. Swivel the optics unit (3)
to enable the bulb (13) to be pulled out of the bulbholder. Clean the glass
dome of the new bulb carefully with a soft cloth. Insert the new bulb so that
the locating pin on the bulb body fits into the guide in the bulbholder. Re-fit
the bulb cover (12) into the optics unit (3) and slide the bulb cover back down
into position.
Handling HEINE OMEGA
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 headband 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 over-band
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 comfortable 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, pencil-
sized 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 head-
band slightly to the side. Adjust up the PD setting by closing first one then the
other eye and observing an object in the middle of the light spot while adjus-
ting 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.
med 1712 2013-10-02
500 Headband
®