Magnifying glass according to the appearance classification can be divided into portable magnifying glass and desktop magnifying glass, desktop magnifying glass is can be fixed, there is a base below, above is a magnifying glass, the shape of the magnifying glass can be rectangular or square, or round, such a magnifying glass is mainly used for long-term fixed viewing of a place.
Desktop magnifiers can have long arms and bent places, and can be changed at will according to needs.
Portable magnifying glass is just like above, a round magnifying glass in front of a handle, there are many types of portable magnifying glasses, some magnifying glasses are square, there are also magnifying glasses that can be combined, such magnifying glasses are mainly easy to tie and carry, easy to observe. Portable magnifiers are also available with and without light sources, and magnifiers with light sources have many benefits when viewing, and the light remains very stable.
Classification by user group:
It can be divided into reading magnifying glass for the elderly magnifying glass for children outdoor portable magnifying glass professional identification measurement magnifying glass;
Glasses can also be regarded as a type of magnifying glass. It is rumored that this masterpiece was invented by someone at the end of the 13th century.
Probably an unknown craftsman in China
It could also be Alessandro di Spina of Doscani, Italy.
Or maybe it's the British scholar Roger Bacon.
In 1260, Marco Polo described how old Chinese people wore glasses to enlarge fonts when they read words.
Large oval-shaped, crystal stone, quartz, topaz, amethyst are ground into lenses, and set in the turtle shell as a frame, the glasses are one made of copper snapped to the sideburns, the second is tied to the ears, and the third is fixed to the hat.
At that time, magnifying glasses were expensive and a status symbol, and a squire once exchanged a horse for a pair of glasses.
If it's just a magnifying glass, hold it in your hand when reading.
Highly transparent lenses made in Venice and Nuremberg were once famous in Europe.