Is it true that Army issued glasses count as "eye pro" in certain situations?

Army issued eye protection meets certain International safety standards for ballistic eyewear. Army issued prescription lenses do not meet the requirements, in any way shape or form. Sometimes people's local policies may allow soldiers to wear glasses when there is no real threat of ballistic injury. For instance, a local policy might require soldiers to wear eye protection in the motor pool, or prescription lenses.
As for where you can find this in documentation, look to the a p e l website. It shows all of the army authorized ballistic eye protection, and explains what the rating is. Ballistic eye protection is stamped with a mark that says Z87.

yes. anytime I had to qualify, military or civilian, I always used just my prescription eyeglasses. that includes the BC glasses issued in basic, check with the eye clinic

Military issue glasses are rumored to protect against procuration

Here's a FAQ about prescription lenses from PEO. Technically, there's no difference between BCG and normal civilian lenses, only the APEL lenses are approved.

So I do remember in 2004 putting in for prescription Wiley-Xs in 1st ID so I guess the determination was they werent good enough although I was allowed to wear them in 3ID as eye pro.

Prescription glasses are not considered eye protection because they are not a Z87 series ballistic eye wear. Issued eye protection can be fitted with prescription lenses but you need to go to optometry to get them done.

Have you checked AR385-10, Army Safety Program?
While the frame of choice are more durable than civilian equivalent they are not ballistically rated.
The actual eye pro and the inserts are free and will actually protect your eyes, so I highly recommend them. Or better yet, look into the eye surgery. I think buying those machines are the best investments the Army ever made.

I was always told that they do count, but I can't cite a regulation to that effect.

It is my understanding that glasses are not eye pro. If you think about it most are issued or buy prescription lenses for Army issued eye pro prior to deployment. This is not to mention the fact that standard issued glasses do not cover the same facial structure required of eye pro. Thank you for your service.