Required for the maintenance of phospholipid turnover within the photoreceptor. a 1,2-diacyl-sn-glycerol + ATP = a 1,2-diacyl-sn-glycero-3-phosphate + ADP + H(+) Expressed specifically in adult eye. Flies exhibit photoreceptor cells that degenerate within a week after eclosion. Belongs to the eukaryotic diacylglycerol kinase family. Intron retention.