| Abbreviations | Meaning |
 | O | Eye [Lat. Oculus]; Opening; Ovary Transplant; Pint [Lat. Octarius]; See Omicron |
| LVET | Left Ventricular Ejection Time; Low Volume Eye Test |
| VID | Visible Iris Diameter |
| PP | Peyer's Patches |
| ITR | Intraocular Tension Recorder; Intratracheal; Inverted Terminal Repeat; Isotretinoin |
| OASD | Ocular Albinism-sensorineural Deafness [syndrome] |
| IOVA | Intraocular Vision Aid |
| SPR | Superior Peroneal Retinaculum |
| PCIOL | Posterior Chamber Intraocular Lens |
| NON-REM | Non-rapid Eye Movement [sleep] |
| AOC | Abridged Ocular Chart; Allyloxycarbonyl; Amyloxycarbonyl; Anodal Opening Contraction; Area Of Concern |
| IOFB | Intraocular Foreign Body |
| ICL | Idiopathic CD4 T-cell Lymphocytopenia; Implantable Contact Lens; Intracranial Lesion; Iris-clip Lens; Isocitrate Lyase |
| IRMA | Immunoradiometric Assay; Intraretinal Microvascular Abnormalities |
| VORS | Vestibulo-ocular Reflex Suppression |
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