Yes wear contacts. Get a good pair of glasses too. Don't stress over these things too much, but yes, take care of these little things now as they can add up to be headaches later. However, WHEN to get them is important. If you are still on your parent's insurance or have good insurance from a significant other or whatnot, then definately get them now. Otherwise, you may be surprised with how decent some med school insurance is, so check it out.
Sorry to go a little off subject, but IF YOU ARE GOING TO BE AN OUT OF STATE STUDENT IN OHIO, and other state schools for that matter, look into the school's policy of becoming an independent. In Ohio, you must have your own insurance unless you are married to be considered an independent. If you stay on your parent's insurance (yes some allow even professional students to stay on their parent's insurance), then you are not independent, and may put in state residency status (and in state tuition for years 2-4) in jeopardy.
I basically went to the dentist to make sure every thing was cool, didn't need any root canal's done or anything and went to get a good pair of glasses and 1 years worth of contacts on my parent's insurance before I went to med school and took their decent, but definatly lesser insurance to ensure in state residency.
good luck.
sscooterguy