RTN – Digital Retinography
Digital retinography is merely a high definition photograph of the ocular fundus. This image can be obtained with a fundus camera or with laser scanners, and it is performed without needing to dilate the pupil. Traditional retinography produces a colour image of the ocular fundus that is generally used to screen certain diseases, such as diabetic retinopathy, or for clinical monitoring of hypertensive retinopathy and benign neoplasms, such as choroidal nevi.
Then there are other types of retinography, each designed to specifically study various details: in darkened light (blood vessels, haemorrhages, drusen, exudate), in blue-green light (layer of nervous fibres, internal confining membrane, folds, retinal cysts, epiretinal membranes) and in red light (pigmented lesions, choroidal cracks, choroidal vessels).