Eyeglasses are a great way to improve your vision and style. But finding the right pair can be tricky, especially if you’re not sure what looks good on you. That’s where virtual try-on apps come in.

Warby Parker has added a virtual glasses try-on feature to its iPhone mobile app. The glasses maker traditionally has allowed the testing of up to five frames at home for free over a five-day period.

Anyone with below-average eyesight knows that shopping for glasses can be an arduous experience. Finding the right frames that fit your face and your style can be a challenge—and an expensive one at ...