These ThinOptics Readers + Silver Keychain Case are so great -- wherever you go and whatever you read when you get there, having your keys and reading glasses with you is key -- pun intended. A marvel of modern engineering, this durable Silver Keychain Case masterfully holds and protects your Readers until you need them. And when you do, clear vision is just a slide of the finger away Choose from four lens strengths (+1.0, +1.5, +2.0, +2.5 diopters) and six frame colors Attach them to your keys for Always With You convenience, or fasten to a backpack, golf bag or luggage for easy access anywhere