Welch Allyn 88460 Optical Colposcope with Swing Arm Roller Stand - User Manual - Manual (Page 9)

5
The colposcope is now ready to use. Turn on the obser-
vation light (A) and use the rheostat (B) to regulate light
intensity.
Optical Adjustments
1. Mark a small “X” on a piece of paper. Place the
paper in the patient location area.
2. Move the colposcope to roughly 12” from the paper.
3. Stand or sit behind the colposcope as if performing
an examination. If the Tilt Stand is used, firmly place
the operator’s feet on the base of the stand. (See
page 2).
4. Set the “0” on the ocular eye pieces to match the
dots on the corresponding housing (A).
NOTE: It is better to use the colposcope without
glasses, making the necessary allowances
with the optics of the instrument. However,
in case of a heavy astigmatism, special eye-
pieces can be ordered, see “Special Eye-
pieces” on page 5.
5. Adjust the spacing of the eye pieces (C) by gently
moving the ocular housings (A) back and forth until
the desired interpupillary distance is achieved.
6. Turn the instrument on and look through the eye
pieces (C) to make a gross focusing adjustment by
moving the entire colposcope forward and backward
to locate the prepared “X” in the 15mm diameter
field of light. Use the rheostat knob to adjust the
light intensity.
7. Looking only through the left eye piece, rotate the
fine focusing handle (B) until the image of the “X” is
sharply defined.
8. Looking only through the right eye piece, adjust by
turning the right eye piece ring until the “X” is
sharply defined.
9. Look through both eye pieces (C) to check that the
fields converge into a single field. Correct slight inter-
pupillary distance by moving the ocular housings (A).
Once the instrument is focused, no additional optical
adjustments are needed.
NOTE: When using the instruments for examina-
tions, all further adjustments are made by
using the fine focus adjustment handle (B).
Use this handle to tilt the instrument up and
down to correspond with the angle of vision
through the speculum.
Adjustment of Ocular Eye Pieces
This model has a focusing grid located in the left eye
piece housing with one internal double circle and one
external single circle for measuring. Turn the left eye-
piece until both circles of the internal double circle are
focused. Using the fine focusing handle, focus on an
object. Now bring the right eyepiece into focus. Located
on the outside of the housing is a chart that shows the
diameters of the objects within the circles at the differ-
ent magnifications.
Special Eyepieces
Spectacle users should order flat eye pieces for the ocu-
lars. To replace the ocular eye pieces, tilt the colposcope
forward. With a jewelers screwdriver, loosen the set
screw located on the knurled eye piece ocular ring and
unscrew the eye rest. Do not rotate the ocular housings.
Screw the flat eyepiece securely in place and tighten the
set screw.
Green Filters
Engage the green filter to enhance the view of blood ves-
sels by turning the filter knob one quarter turn. (D)
A
B
A
B
C
A
B
C
D