Cannot be repaired: When the damage is severe and there are no spare parts or accessories available, welding or electroplating cannot be performed, and thus the item cannot be repaired.
Partial repair: It can be used after welding, but the surface coating will inevitably peel off and change color. After deformation correction, sometimes the traces cannot be completely eliminated and repair marks (such as indentations, abrasions, etc.) will still remain.
Complete repair: Such as replacing screws, polishing, nose pads, lenses, frames, etc. Problems such as loose screws, slight deformation of the rimless sunglasses, and adjustments can all be completely repaired.
After repair, it may not be fixed properly and could even cause further damage to the glasses. No matter how skilled the repair personnel are, they cannot prevent the possibility of the glasses being damaged. Sometimes, the men's sunglasses may seem to be only slightly damaged on the surface, but the hidden problems are very serious. It is only when they are repaired that the serious situation becomes apparent: they break immediately after repair. To reduce the risks, it is best to prevent the cycling sunglasses from being damaged and deformed repeatedly, and to avoid exposing them to impacts and squeezes. Do not repair the best spectacle frames yourself or ask non-professional personnel to do it.
Before seeking professional repair services, you might hear the repair personnel asking for your opinion: The damage and deformation are severe. Try to repair it as much as possible. There is a risk of further damage and it cannot be compensated. The responsibility for the consequences lies with you. If you disagree, you can choose not to have it repaired. This prior agreement helps avoid disputes later on and complies with the regulations of the industry association, being reasonable and legal.
2. Material of the lenses:
(1) Crystal lens:
A crystal sheet is a natural quartz crystal, with the main component being silicon dioxide. Its refractive index is approximately n = 1.54. Colorless and transparent crystals are called crystals, while those with color are called tea crystals. Among the tea crystals, those with different shades of color are classified as dark ink crystals, medium-colored tea crystals, and light tea crystals.
Before the advent of glass, people mainly used crystal to make glasses. However, the quantity of glasses made from natural materials was very small. Nowadays, a large number of glasses are produced using artificial methods to create artificial crystals. The purity of the crystals produced by artificial methods is high, with fewer defects, excellent optical performance, and high production efficiency. This has led to a significant reduction in the price of crystal glasses. Artificially manufactured crystals are generally colorless and transparent. After being treated with lasers and X-rays, they can be made into various colors, including brown. There are also treatments such as double-sided treatment.
Crystals are heavy, have high hardness, are difficult to process, and their absorption of infrared and ultraviolet rays is not as good as that of clubmaster sunglasses . Moreover, natural crystals often have double refraction, uneven material, and are expensive. Therefore, as eyeglass lenses, crystals have gradually been replaced by glass sheets and plastic sheets.
