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Spectacles, also known as glasses, are a type of eyewear that corrects vision by refracting light. There are several types of glasses, including single vision, bifocal, progressive, and transition lenses. Single vision glasses correct nearsightedness or farsightedness, while bifocal lenses correct both nearsightedness and farsightedness. Progressive lenses provide a smooth transition between near and far vision distances, and transition lenses darken in bright sunlight to reduce glare. When choosing spectacles, it's important to consider your lifestyle and the tasks you need to perform, as well as your budget and personal style preferences.