Force does not come out of thin air, stress is generated by the elastic force of the cheapest eyeglasses frame on the lens. The glass lens is not prone to lateral deformation inside, and the optical differences we can detect are not significant, but the elasticity it receives from the frame is consistent.

Stress still exists, and careless processing of glass lenses can easily lead to breakage, which is caused by stress. A while ago, I got a new pair of glasses, but as long as I wear them, I feel dizzy and disoriented; Checked the lens parameters, tilt angle, etc., and found no abnormalities. So I persisted in wearing it for a week with the idea of "wearing it for a while will make it comfortable", but the symptoms still did not improve.

Have you ever checked the stress on the lens with great difficulty? So we used a pair of polarizing mirrors to detect stress. After a simple comparative test, it was found that the new glasses do indeed exhibit stress phenomena.

So, why do discountglasses lenses have stress and what specific effects will they have on wearers? All matter has stress. What is stress?

When a material cannot produce displacement under external force, its geometric shape and size will change, and this deformation is called strain. When a material undergoes deformation, an equal and opposite reaction force is generated internally to resist external forces, and this reaction force is called stress. The cheapest eyeglasses online lenses will experience internal stress and stress phenomena in two different scenarios.

Most lenses are made of plastic materials, and during this process, two types of internal stress phenomena occur in the lenses: orientation stress; The second is shrinkage stress.