Contact lenses have front and back sides.

Put the contact lens gently on the pad of your right index finger, with the lowest point touching the pad of your finger, and let the surrounding sides rise naturally. If it is straight, the lens will be "U" shaped when viewed from the side. The edges are slightly buckled inwards, and this smooth arc shows that the contact lenses are now placed frontally.

There are many ways to distinguish the pros and cons of contact lenses, the most commonly used are four: 1. Observation method

Put the contact lens on the index finger of your right hand and observe the edge of the lens. If If the edge is not rounded and is in a disk-like state, it is the reverse side of the lens; if the edge of the lens is curved with a large arc, it is bowl-shaped, which is the front side. This method is the simplest and most commonly used.

2. Squeeze method

Place the lens between your index finger and thumb, and squeeze the two fingers gently towards the middle. The side of the lens that turns over is the front of the contact lens; The side that has no elasticity and no flipping is the opposite side of the lens. When newbies try this method, remember not to use too much force or risk breaking the lens.

3. Pushing method

Put the lens in the lens box with care solution and push it with a stick. When the fit between the lens and the care box is very good, simply push it. To put it bluntly, this is the front side of the contact lens; but if it is very easy to push and the lens will overlap with one push, then it is most likely the back side of the lens.

IV. Wearing method

After wearing the lens, if there is a strong foreign body sensation and sometimes blurred vision, etc., it may be that the lens is worn backwards. In this case, remove the lens. Just rinse it again and wear it again.