Vision relies on the exchange of information between the eye and the brain through a million nerve fibres forming the optic nerve. This makes the optic nerve head, the exit point of these fibres from the eye, arguably the most important structure to assess eye health. The increasing number of methods available to visualise this structure in the back of the eye, however, can be confusing for patients and clinicians alike.
This study investigated and compared most commonly used techniques to estimate the size of the optic nerve head, one of the fundamental parameters in its examination. As a consequence, recommendations were developed for clinicians to ensure that measurements outcomes and interpretations remains consistent irrespective of the image technique used.