The reasons for deformation of acrylic lenses may include:

1. Scale reasons: The thinner the mirror, the larger the mirror size, and the easier it is to deform. This is a characteristic of acrylic. Appropriately increasing the thickness and size can effectively avoid deformation.
2. Reasons for installation: Make sure the back wall is flat during installation to avoid problems such as tilt and dents from being magnified on the acrylic mirror. The thinner and larger the mirror, the more obvious the camouflage effect.
3. Environmental reasons: Acrylic is a thermoplastic. Long-term use in high temperature environments will cause serious deformation of the mirror surface. The deformation temperature of acrylic is 100°C, and the continuous use temperature cannot be higher than 90°C.
4. Hygroscopicity: The acrylic material itself contains polar side methyl groups and has obvious hygroscopicity. The hygroscopicity rate is 0.3%-0.4%. After absorbing moisture, the mirror surface will expand and deform. Therefore, the acrylic mirror is more likely to deform when used in a humid environment. .
In summary, deformation of acrylic lenses can be caused by a variety of factors such as size, installation, environment, and hygroscopicity. In order to reduce deformation, you can appropriately increase the thickness and size when designing the product, ensure that the wall surface is flat during installation, and avoid being in a high temperature environment or using in a humid environment for a long time.