This document discusses retinal investigations and provides information about Dr. Rajarathna Thangavel's social media platforms for ophthalmology education. It lists fluorescein angiography, autofluorescence, optical coherence tomography, and optical coherence tomography angiography as key retinal investigations. Contact information is provided for Dr. Rajarathna's YouTube channel, Facebook group, and Facebook page where further discussion of retinal investigations can be found.