| Abbreviations | Meaning |
 | IO | Incisal Opening; Inferior Oblique; Inferior Olive; Internal Os; Interorbital; Intestinal Obstruction; Intraocular; Intraoperative; Intra-osseous |
| GED | Graves' Eye Disease |
| SDSEM | Spinocerebellar Degeneration-slow Eye Movements [syndrome] |
| SREM | Stage Rapid Eye Movement |
| XOAN | X-linked Ocular Albinism Of Nettleship-Falls |
| PP | Peyer Patches |
| EOM | Equal Ocular Movement |
| IOVA | Intraocular Vision Aid |
| IPD | Interocular Phase Difference |
| ULLE | Upper Lid Of Left Eye |
| RDT | Randomized Discontinuation Trial; Retinal Damage Threshold; Routine Dialysis Therapy |
| OHS | Ocular Histoplasmosis Syndrome |
| DE | Deprived Eye |
| RET | Reticular; Reticulocyte; Retina; Retention; Retained; Right Esotropia |
| IL | Intraocular Lens |
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