Kowa VX-10a, Instruction Manual, Page: 39 / 64

4. Other practical photography
Other pr
actical photog
ra
phy
4
P4-2
n
Small pupil mode
• The pupil with a minimum diameter of 5.5 mm can be photographed
in mydriatic mode. When in small pupil mode, the diameter of pupil
to be photographed can be reduced to a minimum diameter to 4.0
mm.
• In case the examined eye's pupil is obviously 5.5 mm or less in
diameter, immediately after selecting mydriatic color mode or
mydriatic fluorescein angiography mode, select the small pupil
mode by pressing the S.P. button, before starting photography.
• In case the examined eye's pupil is 5.5 mm or so in diameter,
tentatively observe and perform aligning. When an image should
have shadow in its center or peripheral, switch to the small pupil
mode by pressing the S.P. button.
• In case the small pupil mode is used, the field angle of photography will be 45° and 27°.
• In case the pupil diameter is 4.0 mm or less, uniformly exposed images cannot be photographed.
• It takes about three seconds to switch to small pupil mode.
Since photographing immediately after switching the mode does not allow you to capture a good image, wait
at least three seconds before starting photography.
4-3 Red-free photography (mydriatic color mode)
This paragraph describes red-free photography with green filter.
The designated green filter is available as an option.
1) Select “Color” by the mode select button on the right-hand panel.
2) Insert the green filter into the slot on the side of the main camera unit.
Now the patient observation light turns green.
3) The subsequent procedure is the same as in the items of “3-3
Mydriatic color photography.” Proceed to photography following the
preceding paragraph.
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In red-free photography, red-less light is produced by absorbing red wavelength from light, and as a result,
good fundus pictures are obtained in which blood vessels have a high contrast with the retina.
In these types of photography, roll of ISO 400 B&W negative film (3-times-development) or of B&W ISO
1600 film (standard development) is recommended.
If obviously 5.5 mm or less in
diameter, try to photograph
in small pupil mode.
If 5.5 mm or so in diameter,
try to photograph in mydriatic
mode.
2) Filter inserting slot