Spectacles are eyeglasses. People wear spectacles because their vision is flawed.
Spectacles is an old-fashioned word, but it means something you probably see — and maybe even use — every day: eyeglasses. People who have defective vision need spectacles to see properly. Spectacles have two main parts: the lenses and the frames that hold the lenses. An ophthalmologist (eye doctor) can test your eyes and see if you need spectacles. You can also call spectacles glasses or specs.