Is vision a common noun

Yes, the Word 'vision' is a common noun, a Word for anyone's vision or any kind of vision.

A proper noun is the name of a specific person, place, thing, or a title; for example:

• Vision Street, Las Vegas, NV or Vision Drive, Apex, NC
• Stanford Vision Lab, Stanford University, Stanford, CA
• The Vision Inn Motel, Falls City, NE
• "Fatal Vision", (true crime), by Joe McGinniss