abnormal retinal photoreceptor morphology abnormal retinal cone cell morphology CL:0000573 MP:0001006 MPheno.ontology abnormal cone morphology abnormal cone photoreceptor morphology abnormal cones any structural anomaly of one of the photoreceptor cell types in the retina, in which the photopigment is in invaginations of the cell membrane of the outer segment; cones are less sensitive to light than rods, but they provide vision with higher spatial and temporal acuity, and the combination of signals from cones with different pigments allows color vision