| OX | optic chiasma; oxacillin; oxalate; oxide; orthopedic examination; oxytocin |
|---|---|
| PION | posterior ischemic optic neuropathy |
| POA | pancreatic oncofetal antigen; phalangeal osteoarthritis; preoptic area; primary optic atrophy |
| SOD | septo-optic dysplasia; superoxide dismutase |
| TON | traumatic optic neuropathy |