Eyeglasses ABC

Eyeglasses are just designed as extra eyes placed in front of you, in order to help you see things clearly both at hand and far away. Two circles, two temples and two nose pads are combined into one eyeglasses frame. And two customized lenses are inlaid in frame. The eyeglasses are usually braced by pads on the bridge of the nose and temples placed over the ears. Originally prescription eyeglasses are created for correcting people’s vision, because blurred vision brings a lot of trouble to their daily life. But nowadays, most designers manage to add more attractive elements on eyeglasses aim to lead current and overstep vogue.

The frame of eyeglasses are commonly made from metal or plastic. There are several different metal materials for making a frame, such as Titanium, Monel, Stainless Steel and so on. Traditionally eyeglasses lenses were made from glasses, but today most lenses are plastic. Although different types of frames and lenses you can choose to prescribe a new eyeglasses, the essential elements of eyeglasses are similar.

Eyeglasses frames must be manufactured with great attention to detail because they are critical in supporting lenses to improve vision, they must be comfortable for the wearer, and they are an accessory to professional dress and personal style.Plastic is a great material for frames because it comes in a variety of colors, textures, and patterns. Metal frames are lightweight, strong, and hold their shape well. They also can be made in or coated in various colors.

Most prescription eyeglasses are spherical lenses for correcting in diopters. Lenses are classified by the bent of the two optical surfaces. If a patient has an astigmatism, the patient needs two different correction powers in two different meridians. Since the cylinder and sphere powers almost always separated by 90°, the axis is also the location of the sphere component.

Prescription eyeglasses can be either positive or negative, depending on the lenses.Various lens treatments and tints are added after the lenses are shaped but before they are inserted in frames. The coatings are added by dipping the lenses into heated metal bins filled with the treatment or tint. The treatments and tints available include various sunglass tints and colors, ultraviolet light tints, durability and impact-resistant treatments, and scratch-resistant treatments.