Glasses, also known as spectacles or eyeglasses, are visual aids worn on the face to correct or improve vision. They consist of lenses mounted in a frame that sits on the nose and ears. Glasses can be used to correct nearsightedness, farsightedness, astigmatism, and presbyopia, among other vision problems. They can also be used for eye protection, fashion, or to block blue light from digital screens. Research in the field of glasses focuses on improving lens design, material technology, and frame comfort to enhance visual acuity and comfort for wearers. Additionally, research is being done on smart glasses that can provide augmented reality experiences or monitor health metrics.