| OMT | object modeling technique; ocular microtremor; O-methyltransferase; ophthalmic medical technician or... |
|---|---|
| OPDG | ocular plethysmodynamography |
| OPG | ocular pneumoplethysmography; orthopantomogram; oxypolygelatin |
| OT | objective test; oblique talus; occlusion time; occupational therapist, occupational therapy; ocular ... |
| POHS | presumed ocular histoplasmosis syndrome |