What are the types of contact glasses: half year and one year types?

Refers to the expiration date of contact glasses.

Of course, it refers to the time of wearing, the half-year type is to wear it for almost half a year, and then you should re-match it, and the one-year type is the same, and it is not that you don't take it off if you wear it, you still have to take it off every night, otherwise it is not good for the eyes.

It refers to a change every six months and a year.

Duration of use: Lens type Features Annual disposable type One year of use. The material is the best, the ability to prevent the growth of bacteria is strong, and the lens is more adaptable, but it must be cleaned and deproteinized.

Half-year disposable type is used for half a year. Seasonal disposable type is used for 3 months. Monthly disposable type: Use for 1 month.

Daily disposable type: 1 day of use. Replace it every day, convenient and hygienic Water content: Range Features Low water content <40% Suitable for low-grade astigmatism, dry eyes, computer workers Medium water content 40% 45% Suitable for general users High water content >45% Good softness, good oxygen permeability, suitable for people with moist eyes Diameter:

The maximum straight-line distance between two pairs of points on the edge of the lens is called the lens diameter, and the selection of the diameter is determined by the width of the wearer's palpebral fissure and the diameter of the cornea If other parameters are the same, the larger the diameter, the looser the lens is worn; Center thickness: The thickness of the lens determines the toughness, formability, durability and wearing comfort of the lens; In particular, customers with astigmatism should choose thicker lenses, because thicker lenses have good toughness, good formability, and tear filling in the space between them and the cornea, thereby reducing the impact of astigmatism, while thin lenses will change their original shape with the shape of the cornea, and cannot form an ideal optical interface.

Original source. Satisfied.

Semi-annual contact lenses refer to contact lenses with a shelf life of 6 months, and due to the need to use them for a longer period of time, semi-annual contact lenses will have lower water content and higher air permeability than short-term contact lenses. If you use contact lenses that have been thrown away for half a year, you need to take care of them every day to ensure that the lenses have a better sense of use, which will be more troublesome to use.

Half a year, contact lenses need to be discarded after about 5 months of use. The use time of contact lenses is calculated by hours, if it is calculated according to the amount of wear for 8 hours a day, the contact lenses will have reached the expiration date in about 5 months, so they need to be replaced at 5 months.

Hello, in fact, half a year is relatively good, and you can take a look at the official website of Meiyan by yourself.

Generally speaking, the shorter the time, the more hygienic it is. As for the brand, I prefer Haichang and Hailien's, and Bausch & Lomb's is okay. It's better to pick a thinner one. Hope it helps.

You can wear it for the first time to wear it monthly or quarterly, and I personally recommend that it be seasonally thrown, and the brand can be Haichang or Bausch & Lomb.

If it is the first time to wear, the qualitative effect of the annual throw is better than the price, it is easy to wear and take off, and it is an unknown for their glasses and habits to be suitable for long-term wear and willing to wear for a long time. If you are already a veteran, and it may be due to work needs or personal preferences, you need or plan to wear it every day, you can choose to throw it quarterly or monthly or even daily, their advantage is that it is thinner and thinner, thin means that the comfort of long-term wear will be higher than the comfort of annual throwing and semi-annual throwing, and even if you choose to take the daily throw for a long time, the problem of soaking in the medicine is eliminated, and the risk of infection can be reduced, but the problem is not to find it off, because it is very thin, but it is not very handyI have even heard of cases of tearing off the corneas together, of course, there are a few of them.

In fact, there is no difference at all in essence......For us, half a year and a year are about the same, but the time of wearing is different.

Half-year throws may be thinner and softer, except for the wearable time, there is not much difference.

The annual throw is thicker than the half-year throw.

The holding time is different, and the time of use is different, one is used for half a year, and the other is used for a year.