The quickest way to find out if you have coverage for prescriptive eyeglasses would be to check your booklet, by going online to your insurer's portal.

For Cooperators www.cooperators.ca
You may view a PDF form of your Booklet. Hard Copies are no longer available.
Alternatively, you may ask the plan administrator at your workplace for a PDF version.
You may also call Cooperators customer service: 1-800-667-8164
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For Greenshield www.greenshield.ca
You may register online first (if not already done) to view your booklet.  You may even submit a "sample" claim to check if it is a covered benefit before you purchase the item. Alternatively, call Greenshield customer service: 1-888-711-1119