9
7.1 Purpose
Keeler Jazz Ultra Ophthalmoscopes described in these
instructions have been designed for the examination of the eye
and its background.
7.2 Lens wheel and correcting lenses
The correcting lenses may be adjusted on
the lens wheel.
The following correcting lenses are available:
diopters 0 to +20 and 0 to -20. Readings will be
displayed on a lit panel. Plus values are displayed
in black digits and minus values in red digits.
7.3 Apertures and filters
The following apertures and/or filters may be
selected by the aperture and filter wheel:
7. Ophthalmoscope and accessories
Aperture
Function
Small Circle
Designed specifically for examination
of the macular region of the fundus
where a larger beam would create
excessive papillary reaction or
patient comfort
Semi-circle
For reduction of reflexes of small pupils
Large Circle
For standard fundus examination
Fixation Star
For definition of central and eccentric
fixation
Red-free filter
To increase contrast for assessment of
changes in fine vessels, i.e.
retinal haemorrhages
Cobalt Blue filter
Used with fluorescein dye for the
detection and examination of corneal
scars and abrasions
