| 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 |