has part has part has_part characteristic of has modifier abnormal optic cup morphology absent optic cup absent eyecup absence of the double walled structure formed by expansion and invagination of the distal end of the optic vesicle that develops into the pigmented and neuronal layers of the retina, with the mouth of the optic cup developing into the pupil of the eye MP:0013820 absent ophtalmic cup absent ocular cup absent eye cup abnormal absent optic cup