Many systemic diseases have ophthalmic manifestations with visible pathological features affecting the fundus of the human eye. Visualisation and documentation of anatomic structures of the ocular fundus provides valuable information leading to the diagnosis of various ocular diseases. The efficacy of any treatment will depend upon a reproducible method to evaluate not just the presence of disease but also its extent. Digital image processing techniques provides a means for quantifying the visible pathological features in fundus images of diseased eyes so that the natural progression and response to various forms of treatment, such as laser therapy, can be reliably monitored. A colour scanning laser ophthalmoscope (SLO) will satisfy the requirement of a true imager for the ophthalmologists and provide a powerful tool to the physicists for the development of image processing techniques for retinal imaging. The authors have developed a basic method of forming a true colour digital SLO image. Using the SLO developed at the authors' department, patients with retinal pathological conditions such as diabetic retinopathy, optic disc drusen and angloid streaks were imaged. Results are presented comparing the colour SLO image and the colour photograph from the fundus camera. (6 pages)


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