Glass is a non-crystalline amorphous solid used in window panes, tableware, and optoelectronics. Egypt made the glass. Silica, bleaching powder, alkaline metal oxides, calcium oxide (lime), etc. are used to make ordinary glass. There are gender- and material-specific spectacles. –
According to lenses type
Glasses were constructed of glass when first invented. Glass is heavy and shatters quickly, inflicting eye harm. Pure glass lenses are no longer popular.
California’s Armorlite Lens Company invented plastic eyeglass lenses in 1947. The lenses were made from CR-39, PPG Industries’ 39th thermosetting plastic composition from 1940. This lens material is half the weight of glass, cheap, and gives great optical quality. It’s popular for eyeglass lenses because of these reasons.
In the 1970s, Gentex introduced polycarbonate lenses. The material was designed for Air Force helmet visors, bank “bulletproof glass,” and other safety uses. Polycarbonate lenses are lighter and more impact-resistant than CR-39, making them ideal for sports, safety, and children’s eyewear.
Lens manufacturers have created high-index plastic lenses to meet the need for lighter, thinner eyeglasses. This type of lens is thinner and lighter than standard CR-39 lenses.
According to Eyeglass frame style
1.Round type Frames:-
Not everyone can pull off Harry Potter’s round glasses. Retro-style round spectacles have made a comeback, and if you can pull them off, you’ll be in style.
Round glasses with black frames are trendy, so keep your makeup and accessories simple. Light-colored circular spectacles look wonderful on fair skin and light hair. Darker-skinned women with thick hair should choose darker frames.
Choose glasses with slender frames and angular corners if you have a round face. This angles your face. Try bold frames for a square face. The circular spectacles curve a square face.
2.Oval Type Frame:-
Lenses with oval frames are rounded and curved without any sharp corners. Versatile styles are available for this collection. They’re fantastic because they work for just about everyone.
These oval-shaped spectacles can soften the angles of features that are square or triangular. Its attributes will be best complemented by this design. For those who have round faces, oval glasses can be worn in a variety of ways.
3.Boston model frames
The shape of a Boston model frame falls somewhere in the middle between a round and an oval frame. Hybrid frames incorporate aspects of both of the above models.
Curves abound in these eye frames, as they do in the more traditional round and oval shapes. Consequently, they are ideal for square, triangular, and trapezoidal-shaped facades. People with round faces may find these glasses to be a little too round for their face shape.
There are many types of glasses are available that are according to shape, lenses, and medical issues. Other than these types many of them are according to gender like man’s reading glasses, woman’s reading glasses and etc.
From the above, we conclude that Non-crystalline amorphous glass is used in windows, tableware, and optoelectronics. Lighter and more impact-resistant than CR-39, polycarbonate lenses are perfect for sports, safety, and children’s eyewear. Deep-set oval frames are best for heart-shaped faces. Round-faced people may find these glasses overly round. Hybrid frames combine round and oval elements. The Boston frame is round-oval.