Charming images

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Cobra HD

The Cobra HD uses a two megapixel camera in combination with both a white and an infra-red flash along with capture software called Phoenix. Mounted on the slit lamp in the usual way, the camera may be used with either a Mac or PC. Positioning a distance from the patient allows good quality anterior imaging which would be perfectly acceptable for gross assessment or, for example, monitoring a lid or adnexal lesion, but in no way replaces the need for a slit-lamp camera system for magnified image capture. In capture mode, moving the camera toward the patient's pupil, which appears on screen soon, allows an image of the retina and the incorporation of coloured guides indicates when the correct position for capture is reached (the guides are green at this point). Fine tuning before capture is achieved by a small knob on the side of the instrument and accurate retinal image capture is now easy. A 60 x 45 degree image is easily obtainable through an undilated (3mm or more) pupil (Figure 2).