I guess this is why its confusing:
Upon hire 5 years ago, somehow it got ignored that I wore contact lens and employees are required to wear glasses while at work. No contact lens.
The above makes it appear that OP was only wearing contacts.
I said something without thinking one day and, of course, was taken to task and told I'd have to wear glasses.
This also makes it seem like OP was only wearing contacts.
The glasses are brand new, being paid for by the company as required by OSHA.
This makes it appear that, after he was reprimanded, the company paid for the glasses that he was wearing when he made the series of mistakes.
Wearing plain protective eyewear was what I WAS doing before the contact lens confession. I may have to check with the ADA on this.
But, then, you are correct in that THIS statement is different from the other 3.
It is NO problem for me to be able to wear the contact lens with protective eyewear over them. That's what got me into trouble--I WAS wearing contact lens period. The employer does not want anyone wearing contact lens, period. Wearing glasses/protective eyewear is mandatory. I'll still check into the ADA application.
Then OP writes this, which doesn't exactly clear up the confusion. However, I think I see what he is trying to say. He was wearing BOTH contacts AND protective eyewear, and was told he could not wear the contacts at all.
However, I still agree that he should look into MSDS. The employer may be mistaken, as the doctor suggests, in regards to the contacts. The employer may think that they bear some liability if the OP wears contacts and gets an eye injury. I think that OP should follow up on WHY it is a requirement, and, get an opinion from an eye doctor. OP should speak to HR, and see if a eye doctor's note in regards to the contacts, with some type of proof to back it up, would be acceptable.