When were the first glasses invented?
No one knows when the first pair of glasses were invented, but we do know that the grinding techniques for making simple magnifying glasses have been around since 1000 AD, especially in regions where glasses were already produced (including northern Italy). The earliest artwork of glasses appears in the Treviso Cathedral fresco painted by Tommaso de Modena in 1352. There is reliable evidence that eyeglasses were invented in Italy in the late 13th century. The first pair we think of as eyeglasses appeared in Italian pizza in the late 12th century and looked more like two small magnifying glasses (made of raised glass) riveted together at the top of the handle. In 1266, The English Franciscan Monk Roger Bacon wrote about the scientific principles of corrective lenses, but there is no evidence that he applied this knowledge to the manufacture of eyeglasses.
How to Wear Cat Eye Glasses?
Since the cat eye frame glasses are so popular, you may ask whether I can wear the cat eye glasses. Usually, cat eye glasses can suit a variety of face shapes. But faces with more angular or prominent features would look best in a round or oval shaped pair of cat eye glasses because these cat eye frame glasses will balance wide jawlines of square or triangle faces, while the rounded lens will soften sharp features.
However, the round face will look best in frames which are with bold and angular lines. These striking details will help to sharpen soft facial features and rounded jawlines. You can click here to know more knowledge of the face shape and how to choose the glasses frames.
The role of the driving glasses
Good driving glasses can be very good to block high energy light, in the evening they can let more faint light enter into our eyes, really solving the problem of only blocking the light and not blocking the road. They have very good night vision function, and can better eliminate glare, better improve the vision of the driver. The driver can drive safely day and night. Strong sunlight improves visual clarity. They are special driving glasses and can brighten polarized light and improve driving safety. With unisex style, high-definition vision, comfort, and light. It can be used on rainy and foggy days and can be used by myopic people. It can effectively filter strong light and high beam lamps, and the long-term use makes you not tired. Both rainy and cloudy days can improve visual clarity. It can effectively prevent strong light, ultraviolet light, and glare is durable and can solve the problem.
Why is a prescription for glasses different from a prescription for contact lenses?
The frame glasses degrees are the optometric degrees of the eye, and the difference between the frame glasses degrees and the contact lens degrees is mainly due to the different contact distances between the two lenses and the eye. Usually, degrees of contact lenses and glasses need to be converted by a professional through vertex diopter. The conversion formula is Fc=Fs/(1-d×Fs). In the formula, Fc is the diopter of contact lens, Fs is the diopter of glasses frame lens, and D is the distance between frame glasses lens and cornea. Assuming that the prescription of frame glasses is -4.00d and the distance between lens apex is 12mm, the prescription of contact lenses is -4.00/ [1-0.012×(-4.00)] = -3.82d.
How to use the eyeglasses holder straps?
Slide the plastic holder at each end of the string to the ends of the eyeglass arm. Some glasses retainers have pockets at the end of the line instead of plastic retainers.The pockets cling to the arms of the glasses. Tie the string around your head and put your glasses on. Have the rope tied around your neck and your glasses in front of you. If you want to take your glasses off for a while, hold them over your chest and release them so they can hang on the cord.
Recommended Glasses for Heart Shaped Face
Wayfarers frames: to balance out a wider forehead is by finding frames that have wide, prominent endpoints that extend out past your temples. This can draw the gaze up and away from your cheekbones, making your eyes the focal point. So, the wayfarers frames are recommended.
Cat-eye frames: if you do not know how to choose the best glasses for heart shaped faces, you can try the cat-eye frames glasses. They can be quite versatile and help contour your face, either balancing or highlighting prominent features.
Aviator frames: the last glasses for heart shaped face we want to recommend is the aviator glasses. They can work to draw the eye downwards and flatten the bottom part of your face. The aviator frame glasses can also add a balanced look and soften prominent angular features.
What is the processing technology to make the lens thin?
For myopic lenses, the larger the diameter, the thicker the edge. Therefore, for customers with high myopia, we will recommend frames with smaller ring diameters, so that the edges of the processed lenses will be thinner. The edges of farsightedness lenses are already very thin (convex lenses are thick in the middle and thin on the sides), and the key determinant of lens thickness is the center thickness. In addition to the refractive index, which affects the thickness of the farsightedness lens, the influence of diameter is more important. Therefore, for patients with farsightedness, the most effective way to make lenses lighter and thinner is to choose a smaller frame and then customize a pair of lenses with the right diameter.
