DUI, DWI, and OVI all mean the same thing: operating a vehicle under the influence of alcohol or drugs.
If you operating a motor vehicle and your Blood Alcohol Content (BAC) and breath alcohol content (BrAC) is 0.08 or greater, you are considered to be “operating a vehicle impaired.” The 0.08 figure is a measure of the concentration of alcohol in your breath or in your blood, respectively. If your BAC or BrAC exceed o.17 for breath or blood, you are subject to enhanced penalties, given the higher amounts of alcohol in your system.
If you are stopped and the intervention of law enforcement appears to be turning into an OVI stop, you are not required to participate in field sobriety tests, portable breathalyzer tests, or Intoxylizer tests. However, if you decline, Ohio is an "implied consent" state. Because having an operator's license is a privilege of citizenship, not a right, when you obtain your operator's license, your consent to such a test is implied. This means while you have the right to remain silent, the consequence of refusing an officer's request to test is an administrative license suspension by the Bureau of Motor Vehicles.
While it is not illegal to smell of alcohol, have bloodshot eyes and speak in a slurred voice and you deprive the arresting officer of a breath or blood test, you still may be convicted of OVI based on evidence of impairment. This includes the testimony of witnesses such as the officer or others who may have observed impaired operation.
For many reasons, it's best to get an attorney if you are charged with an OVI.
The acronyms DUI, DWI, OMVI and OVI all refer to the same thing: operating a vehicle under the influence of alcohol or drugs.