Operator`s manual
12
Ophthalmoscopes
EYE, EAR, NOSE AND THROAT
EYE, EAR, NOSE AND THROATEYE, EAR, NOSE AND THROAT
3.5 V Coaxial Ophthalmoscope
> Halogen HPX™ lamp provides 30% whiter, brighter light than standard
halogen lamps for true tissue color and long-lasting performance
> Coaxial optics produce a shadow-free spot, easier entry into
undilated pupils, and a larger fi eld of view versus standard
ophthalmoscopes
> Detect corneal abrasions with cobalt blue fi lter
> Polarizing fi lter virtually eliminates corneal refl ection
> Sealed optics keep out dust and dirt
> 18 unique aperture/fi lter combinations for greater versatility
> Red-free fi lter may be used with any aperture
> 28 focusing lenses with a range of -25 to +40 diopters
The patented Welch Allyn Coaxial Vision System facilitates
op
hthalmoscopy by enabling easier entry into the eye, a larger fi eld
of view, and reduced glare compared to standard ophthalmoscopes.
11720
Coaxial Ophthalmoscope
04900-U
3.5 V Halogen Lamp for 11720 Ophthalmoscopes
3.5 V Coaxial Ophthalmoscope Accessories
Lenses Filters Optical System
28 Lenses Cross-linear Polarizing
Red-free
Cobalt Blue
Coaxial Optics
COBALT FILTER: used with
fluorescein dye to view small
lesions, abrasions, and
foreign objects on the cornea.
SLIT: used to determine
levels of lesions and tumors.
RED-FREE FILTER: excludes
red rays from examination
field for easy identification
of veins, arteries and nerve
fibers.
MICRO-SPOT APERTURE:
allows quick entry into
small, undilated pupils.
SMALL APERTURE: provides
excellent view of fundus
through an undilated pupil.
LARGE APERTURE: standard
aperture for a dilated pupil
and general examination of
the eye.
FIXATION APERTURE: has
graduated cross-hairs for
measuring eccentric fixation
or locating lesions.
11720
Coaxial Ophthalmoscope
Coaxial Optical
Sys
tem
Compact Head
Design
Triple-sealed
Ophthalmoscope
Cross-linear
Polarizing
Filter
Aperture
Selection
Dial
Lens
Selection
Disc
APERTURES FOR:
3.5 V Coaxial Ophthalmoscope, 3.5 V AutoStep
®
Coaxial Ophthalmoscope
and Prestige Coaxial-Plus Ophthalmoscope (models 11720, 11730 and 11735)