OCT imaging and Red / Green disease
New ophthalmic imaging technologies such as OCT typically use a green/yellow/red colour coding when classifying measurements as within or outside normal range compared to the instrument’s normative database. While this is often useful, classifications can be misleading and optometrists need to consider the wide range of confounding factors when interpreting results. Individual patient characteristics such as tilted discs, vitreopapillary traction, myopic staphylomas, small or large disc size, media opacities and eye movements can significantly affect results. Imager-induced errors such as incorrect placement of the line scan, poor focus, or imaging away from the pupil centre are also problematic. A case-based approach will be used to demonstrate these features as well as considering the latest literature on the topic.