Glasses, also known as eyeglasses or spectacles, are devices consisting of glass or hard plastic lenses mounted in a frame that holds them in front of a person’s eyes, typically using a bridge over the nose and arms which rest over the ears.
Safety glasses provide eye protection against flying debris for construction workers or lab technicians; these glasses may have protection for the sides of the eyes as well as in the lenses.
Wearers of glasses that are used only part of the time may have the glasses attached to a cord that goes around their neck, to prevent the loss of the glasses and breaking.
Sunglasses allow for better vision in bright daylight, and may protect one’s eyes against damage from excessive levels of ultraviolet light. Typical sunglasses lenses are tinted for protection against bright light or polarized to remove glare; Photochromatic glasses are clear in dark or indoor conditions, but turn into sunglasses when in they come in contact with Ultraviolet light.Most over the counter sunglasses do not have corrective power in the lenses; however, special prescription sunglasses can be made.
Even with glasses used for vision correction, a wide range of fashions are available, using plastic, metal, wire, and other materials.
People are more likely to need glasses the older they get with 93% of people between the ages of 65 and 75 wearing corrective lenses.
