How to distinguish between positive and negative contact lenses?
When a contact lens is worn backwards, the lens can easily fall out of the eye and cause other discomfort. In order to avoid wasting time and avoid damage to the eyes, today I will talk about how to quickly distinguish the front and back.
Before handling contact lenses, wash your hands and wipe them with a lint-free towel. Then, remove the lens and place it at your fingertips, focusing on the edge of the contact lens. If the edge of the lens is a bowl-shaped smooth arc, it means that it is facing up, and you can wear it directly. If the edge of the lens is slightly turned outwards, it means that it is facing up. In this case, you need to put the lens back in the care solution, turn it over, and then take it out and wear it.
However, for lenses with softer materials, it may sometimes be difficult to distinguish the edges directly by looking at them. At this point, the lens can be placed between the index finger and thumb and squeezed lightly. If the lens is folded inward, it can be worn directly, and if the lens is attached to the fingertips outward, it means that it is reversed and needs to be turned over. The two identification methods can complement each other, and after mastering it can help you effectively distinguish the front and back of contact lenses.
In addition, if you buy colored contact lenses, it will be easier to distinguish the front and back. Just take out the lens, observe the pattern and color on the lens, and the one with clear and distinct layers is face up.
It is very basic common sense to correctly identify the front and back of contact lenses, and it can also avoid wearing discomfort and corneal damage. Everyone must be proficient. The editor also recommends that it is best for everyone to develop a habit and confirm each time before wearing it.