Normal glasses are vision aids consisting of a frame and corrective lenses worn to improve or correct eyesight. They address common refractive errors like myopia (nearsightedness), hyperopia (farsightedness), astigmatism, or presbyopia. The lenses can be single-vision, bifocal, or progressive, tailored to individual needs. Frames come in various materials (plastic, metal) and styles for functionality or fashion. Some glasses also feature coatings (anti-glare, UV protection, or blue light filtering). They are non-invasive, widely used, and essential for daily activities by millions worldwide.