Both the yearly and half a year contact lenses belong to the type of contact lenses with relatively long service life, which is also collectively referred to as "traditional lenses".Since the packaging of the two is often similar, in order to avoid overuse, must make a distinction.
 

   All the information of the product is marked on the package and instructions. The yearly is the contact lens with a life cycle of one year, and half a year is the contact lens with a life cycle of six months.Generally the same brand and series of yearly and half a year product parameters may not differ too much, but different brands and series of contact lenses will have a big difference.Eye data can be obtained in the evaluation, and the parameters can be compared to select yearly or half a year contact lenses.
 

   So why go to the trouble of distinguishing between yearly and half a year sales? On the basis of satisfying the individual needs of consumers, different discard cycles have different requirements for contact lens materials, thus affecting the product composition and lens life.In addition, the lipid and protein in the tears are easy to adhere to the lens. Although most of the precipitation can be removed by daily cleaning, a few will gradually deposit in the material gap, making the lens permeability and comfort decline.Therefore, a comprehensive consideration of the various parameters of the lens, the scientific use of time, in order to make the contact lenses more safe to wear.
 

   The yearly has a good shape, low water content and a long use cycle of one year, which has a high cost performance ratio. Therefore, it has been favored by many people. However, some people think that the half a year shortens the use cycle and reduces more protein deposition, which is relatively healthier.True, yearly and half a year have advantage and disadvantage each, but the difference on main material won't be very big, buy according to yourself need.