Glasses, sometimes called spectacles or eye glasses frames, are non-prescription vision eyewear consisting of rigid, hard plastic or glass lenses mounted on a rigid frame that holds them behind a person’s eyes, usually using a bridge above the eyes and similarly hinged arms that rest across the ears. They are intended to correct eye problems by redirecting light and often increasing a person’s peripheral vision, making it possible for him/her to see things clearly even from afar. However, not all people with vision impairments can benefit from eyewear. In order for eyewear to be purchased by such individuals, there are certain conditions that must be met.
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First, an individual who will be receiving eyewear must be in good physical condition. This includes good vision and a stable frame that will support the eyewear well. Because eyewear functions as crutches for the eyes by redirecting light, people with nearsightedness or farsightedness need larger and more solid frames to redirect the light. In contrast, individuals with astigmatism will require smaller frames because the light that reaches the retina will be refracted when viewed through an irregular shaped lens. Some eyewear even shapes itself to imitate the shape of the eyes so as to help these individuals find it easier to wear eyeglasses.
Aside, from good health, an individual in need of eyewear must also be in good taste. For this reason, eyewear is normally available in two basic styles: ready made and clip on. Ready made frames come in the form of custom-made frames that have been pre-made to fit a specific set of facial features and are usually lighter in weight. Clip on glasses, on the other hand, have been tailor-made to fit the shape of the wearer’s face. In terms of frames and lenses, clip on lenses are usually cheaper than ready-made lenses while ready-made frames are typically more expensive.