| Abbreviations | Meaning |
 | OU | Both Eyes Together [Lat. Oculi Unitas] |
| ICL | Idiopathic CD4 T-cell Lymphocytopenia; Implantable Contact Lens; Intracranial Lesion; Iris-clip Lens; Isocitrate Lyase |
| IOL | Intraocular Lens |
| O | Eye [Lat. Oculus]; Opening; Ovary Transplant; Pint [Lat. Octarius]; See Omicron |
| SBV | Singular Binocular Vision; Soilborne Virus |
| MEH | Medical Eye History |
| BES | Balanced Electrolyte Solution; Baltimore Eye Study |
| CAGE | Capillary Affinity Gel Electrophoresis; Cut Down, Annoyed By Criticism, Guilty About Drinking, Eye-opener Drinks (a Test For Alcoholism) |
| GED | Graves' Eye Disease |
| OPDG | Ocular Plethysmodynamography |
| O2 | Both Eyes; Diatomic Oxygen; Molecular Oxygen |
| SHORT, S-H-O-R-T | Short Stature, Hyperextensibility Of Joints Or Hernia Or Both, Ocular Depression, Rieger Anomaly, Teething Delayed |
| HARD +/- E | Hydrocephalus-agyria-retinal Dysplasia Plus Or Minus Encephalocele [syndrome] |
| COD-MD | Cerebro-ocular Dysplasia-muscular Dystrophy [syndrome] |
| ER | Etretinate |
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