Segment Height, also known as Seg Height or SH, is the vertical measurement in millimeters from the bottom of the lens in your frames, to the beginning of the progressive addition on a progressive lens. Segment height does not apply to Single Vision lenses. The determined Segment Height is specific to each frame and wearer.
Development of round glasses History of round glasses One of the earliest etchings of eyeglasses, dating back to the 13th century, shows some studious clergyman in some ancient monastery squinting at his parchment from behind a pair of round-framed specs. Later, in the early 1600s, a portrait of that well-known cardinal, Fernando Niño de Guevara, shows him sporting yet another pair of circular frames. Of course, these early varieties wouldn’t exactly fly off the shelves today. They often lacked temples, needed to be held by a hand, and were either made of leather or weighty metals like lead and iron. It could be said that the glasses of yesteryear weren’t the best lookers, but they didn’t need to be. They were purely functional, the reserve of a studious and god-fearing elite.
Your choice of glasses is your privilege. If you feel comfortable and confident, you can wear something that is against the rules, then it doesn't matter! Think about your personality - if you are an outgoing party enthusiast, then you are not suitable for more serious and traditional frameworks. Think about your lifestyle – think about how often you wear glasses and where you wear glasses.
Nowadays, the number of people with myopia is increasing. Many teenagers have already put on their glasses. At the university, almost two-thirds of the students wear glasses. More and more people wear glasses, but if the frame glasses are not properly treated, the glasses will be deformed. The deformation of the frame will cause a burden on the nose or ears, and the lenses will be easy to loose. The following professionals will summarize the suggestions on glasses care. Let's take a look!