A fundus camera photographs the retina to document findings and track change over time. Cameras differ widely in how much of the retina they capture, which imaging modes they offer and how easily they fit into a clinic's workflow. This guide sets out what to compare.
Field of view
Traditional fundus cameras capture a field of around 45 degrees in one image, and montage several images to cover more. Widefield and ultra-widefield cameras, such as the Zeiss Clarus family, capture much more of the retina in one or two images. Wider fields cost more, so weigh them against how often your clinic needs to see the peripheral retina.
Mydriatic or non-mydriatic
Non-mydriatic cameras can image through an undilated pupil of sufficient size, which speeds up screening and suits busy clinics. Mydriatic cameras need a dilated pupil but can give better images in some patients. Many modern cameras work either way.
Imaging modes
Colour imaging is standard. Depending on the model, cameras may also offer red-free imaging, fundus autofluorescence and angiography modes. Higher models in a family often add modes, so confirm exactly which ones the unit you are buying has, and whether any require a licence.
Software and records
Check that the camera's software runs on your computers and exports to your electronic records or imaging system, for example through DICOM. Ask whether the software is still supported and receives updates.
Patient images must not travel with the device. Get written confirmation that the existing database has been wiped before delivery.
What to check on a pre-owned unit
Confirm the following before you buy:
- Image quality on a test capture, with no spots or haze from the optics.
- Flash and illumination working in every mode listed.
- The computer, software licences, table and chin rest included.
- Service history and warranty coverage.
- Patient data wiped, confirmed in writing.
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