
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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.