American Diagnostic Corporation (ADC) Diagnostix 3.5v - Manual (Page 7)

Coax Plus 3.5v Ophthalmoscope (Fig. 4).
Plus: 1-45 in single steps
Minus: 1-44 in single steps
The values can be read off in the illuminated field of view. Plus
values are displayed in green numbers, minus values with red
numbers.
7.3. Apertures
The following apertures can be selected with the aperture hand-
wheel (Fig. 5).
Coax Ophthalmoscope:
Semi-circle, small/medium/large circular aperture, fixation star
and slit.
Coax Plus Ophthalmoscope:
Semi-circle, small/medium/large circular aperture, fixation star,
slit and grid.
Aperture Function Model(s)
Half Moon For examinations with turbid lenses Coax/Coax Plus
Micro Spot Allows quick entry into small, undilated pupils Coax/Coax Plus
Small Circle Excellent view of fundus through an undilated pupil Coax/Coax Plus
Large Circle For a dilated pupil and general examination Coax/Coax Plus
Karo (Grid) For topographic determination of retina changes Coax Plus Only
Slit To help determine levels of tumors and lesions Coax/Coax Plus
Fixation star Measuring eccentric fixation or locating lesions Coax/Coax Plus
7.4. Changing Filters
Using the filter wheel, the following filters can be switched for each aperture.
Coax & Coax Plus Ophthalmoscope:
Red-free filter, blue filter and polarisation filter.
Filter Function
Red-free filter: Contrast enhancing to assess fine vascular changes, e.g.
retinal bleeding.
Polarisation filter: For precise assessment of tissue colors and to minimize
retinal reflections.
Blue filter: For improving recognition of vascular abnormalities or
bleeding, for fluorescence ophthalmology.
Switching Aperture
(Fig. 5)
Premium Head
(Fig. 4)