1. A glass lens used to correct a defect in visual acuity or to prevent exposure to bright light if the lens is tinted.
2. A transparent refractive device worn to correct reflection errors in the patient's eyes.
3. A device worn to protect the eyes from glare or particles in the air.

1. An optical instrument consisting of a pair of lenses (eyeglasses) for correcting defective vision and a frame which holds those lenses.
2. Lenses set in a frame which holds them in front of the eyes and that are used to correct errors of refraction or to protect the eyes.

The parts of the spectacles are the lenses; the bridge between the lenses, resting on the nose; and the rims or frames, encircling the lenses; plus the sides or temples that pass on either side of the head to the ears.