The stones were ground flat and could be used in a frame. The diameter of the glasses included 3 cm maximum. The rivet spectacles is considered precursors of today’s glasses, but they possessed no hangers, but was held to the eye using a style. A great advantage of using a rivet spectacles was the magnification of all things. From now on, no more single words or lines piece by piece had to be increased.
Scholars especially enjoyed this invention to read Scriptures and to compensate for poor eyesight in other walks of life. Murano honed glasses of very high quality, because they understood it there to make white glass and then expertly to grind them. Due to the expensive materials and the complex manufacturing process, rivet spectacles were reserved for only scholars and rich. If this has piqued your curiosity, check out New York Museums. This period is probably due to the stereotype that only smart people wear glasses. Today, eyeglass wearers seem serious or made to work. Since then the equation was too high even Apostles were shown in artistic representations with rivet spectacles.
The bar glasses book printing, making painstaking handwritten writing books was invented In the year 1445 Johann Gutenberg. A faster and all higher production of printing works was possible and so grew the need for glasses. So the bar glasses coincided with this invention, which represented an advancement of rivet eyeglasses. In contrast to the rivet spectacles had they not be held with the hands, but kept using a strap on the nose. On the bracket connected the two glasses, cut a piece of the leather was attached, often that a slide down from the nose should prevent. Also, the bar glasses were fitted with chains for the neck, to prevent damage when a slip by the nose. Damage was not only costly, but was also linked to long waits on new glasses. The 15th century marked the birth of concave lenses that correct nearsightedness. Previously, only convex polished lenses were produced, which were conducive for a wide vision. The hat glasses between the 15th and 18th centuries was the so-called Hat glasses, with help of a structure on a hat was attached. This protected from a falling off of the glasses and the hands were free. Especially in women this type of sunglasses was popular, as women often in the House on hats were and they had to take off at the greeting. In men, hat glasses of less were popular because they wore no hats indoors and outdoors to the greetings always had to take them off. Only with men of higher levels, they were also common, since they had to take off the hat to the greetings. The ear goggles at the beginning of the 18th century was the glasses, as it is today. At that time it was referred to as “Temporal glasses” and the jars were fitted with simple metal brackets, which caused most headaches. The ear glasses often has been improved and offers even more advantages, such as free hands in this day and age in addition to a high level of comfort. The further development of the glasses seems to be no end. So, there are more and more new features like sliding sight glasses or plastic glasses.