SUMMARY
Wrong denominations for vertical deviations are relatively usual. Sometimes they result from a failure of an examination or its interpretation (e.g., to take as a right hypertropia an alternating RIL vertical deviation). On the other hand there are terminologies which give ideas of inexistent analogies (e.g., D. V.D. and D.H.D.). But also, the possibility of the sum of independent oculomotor unbalances can not be distingui shed, yet, from another primary disturbance having similar manifestations. For instance: concurrent underactions of a superior rectus and of a contralateral inferior oblique give rise to a deviation which can be taken as a "pure" D. V.D. Or, opposedly, a primary disturbance may be completely masked by another added oculomotor defect (the result of a sum of a D. V.D. and an absolutely conco-mitant vertical deviation leading to a deviation which is only observed during the fixation of one eye). Such conditions are commented.
Keywords:
D.V.D.; D.H.D.; No-menclature; Vertical deviations; Muscular disfunctions; Prope-deutics