What is the shelf life of daily disposable contact lenses? _Industry News_
The beauty, fashion, comfort and convenience of contact lenses bring convenience to many myopia patients. Coupled with regular contact lenses, they can effectively correct refractive, brighten and enlarge the eyeballs, and improve the clarity of the field of vision, so they are favored by more and more people. But many people have overlooked a problem, that is, contact lenses also have the issue of shelf life, so the following editor will introduce to you, how long is the shelf life of daily disposable contact lenses. 1. The shelf life of contact lenses is divided into two situations. The shelf life of contact lenses is divided into two situations, that is, there are two concepts for the shelf life of contact lenses. The first one refers to the fact that it has not been opened after just coming out of the factory. Contact lenses, that is, contact lenses that have not been used before, are generally marked with the production date and expiration date, which is the shelf life of the contact lenses before opening. Generally, the shelf life of contact lenses that have not been opened is about 5 to 7 years. As long as the deadline is not exceeded, they can be used. The second type of contact lens shelf life, that is, the shelf life of the contact lens after opening, is related to the cycle of its use, such as daily, monthly, semi-annual, and annual. Under normal circumstances, the shelf life of contact lenses after opening is calculated from the day of opening, not based on the actual number of days worn. For example, daily disposable contact lenses, if it is opened today, the shelf life starts from today. But theoretically speaking, the shelf life of daily disposable contact lenses is 24 hours, but the actual shelf life is about 18 hours. 2. Contact lenses that have passed the expiration date cannot be used. After the expiration date, the lenses will age, harden, and become discolored, their transparency will also decrease, and the lenses will deform and thicken, which can easily lead to protein. The increase in sediments affects the oxygen permeability of the lens. If it is severe, it is easy to cause inflammation such as conjunctivitis, keratitis, and corneal ulcer, and the foreign body sensation when wearing it will also increase. In short, for the invisibility of daily throw after opening, the shelf life is calculated from the day of opening, not the number of days actually worn. Just keep this in mind.