MENLO PARK, Calif. >> Four years ago, when Meta released smart glasses that could take photos and videos, the product became a surprise hit. Since then, millions have snapped them up.

Now the company is raising its bets on eyewear.

On Wednesday, at its annual developer conference in Menlo Park, California, Meta unveiled three new types of smart glasses. One of them, called Meta Ray-Ban Display, has a tiny screen in its lens that can display apps, share media to Instagram and play music from built-in speakers. The apps on the glasses will be controlled by a wristband. It also has a voice-based artificial intelligence assistant that can talk through a speaker and see through a camera.

Another pair was an upgraded version of its existing Ray-Bans, while the third was meant for sportswear a

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