is an alloy mainly composed of titanium and nickel, so it is also called nickel-titanium alloy. Eyeglass frames mainly utilize the super elasticity of Nitinol. It is a very special alloy that was only produced in the 1970s. It was not until the 1990s that it began to be slowly applied to glasses.

2: The advantage of memory metal is that it has very good elasticity after being made into finished products, and it is difficult to deform at room temperature. Because of this advantage, you don't have to worry about damage due to accidental crushing or damage during daily use. It is relatively durable. But doesn't it mean it won't deform no matter how much it is twisted? Of course not, it also has disadvantages. The first disadvantage is that they are very sensitive to temperature. It can be said that all memory metal glasses on the market will become very soft, have no elasticity, and are easily deformed in zero or sub-zero environments. If it becomes soft due to too cold temperature during use, the solution is to rub it with your hands a few times to let it get a little warm and it will restore its elasticity. Not only will overcooling affect it, but overheating will also destroy its memory performance. We can also use this shortcoming to adjust the shape of the glasses frame. For example, if the glasses are too loose and need to be adjusted smaller, the