Haag-Streit BM 900 Mode D'emploi page 21

A.3 Microscope and eyepiece
The magnification of the microscope can be altered by changing
the lens mounted in a revolving turret piece, or by exchanging
the eyepieces. The lever (60) is to be adjusted from 1x to 1.6x
when changing the lens. In this instance, the examination need
not be interrupted; nor is a new adjustment of the microscope
needed. This change will alter the overall magnification from
10x to 16x (on the 10x eyepiece), and from 16x to 25x (on the
16x eyepiece).
The separate focussing of each eyepiece serves not only to
compensate the refraction divergence of the examiner, but
also to achieve the best possible focussing, in view of the often
somewhat unsymmetrical passage of both microscope beam
paths in fundus examinations.
60 Lens-changing lever
61 Prism housing
62 Eyepiece mounting
63 Diopter scale for eyepiece 16x for setting the refraction
of the examiner (± 8 D)
64 Diopter scale for eyepiece 10x for setting the refraction
of the examiner (± 8 D)
65 Index (white spot)
66 Eyepiece 10x or 25x
Lens 1x
Eyepiece 10x
Total magnification 10x
Object image section ø 18 mm
A.4 Adjustable focusing target
If the lamp cable (67) is connected, the fixation lamp burns as
soon as the power supply switch is activated, then the focusing
target (72) is visible.
The fixation target can be brought into any position by moving
the bearer's arm (68). This permits uninterrupted observation
through the microscope and simultaneous guidance of the
patient's eye to any desired position. This is especially advan-
tageous in examining the fundus.
It's a condition, that the patient's eye is correctly positioned at
the headrest's height marker (71).
Ametropia of the patient from +10 D to -15 D (69) can be
corrected (70). Steady fixation of the eye is maintained as
accommodation and convergence are avoided.
60
61
62
63
64
65
66
1.6x 1x 1.6x
10x 25x 25x
16x 25x 40x
11.3 mm 8 mm 5 mm
67
68
69
70
71
72
1500.7200492.04090 © Haag-Streit AG, CH-3098 Koeniz, Switzerland