How to distinguish the front and back of contact lenses? How to distinguish the front and back of co

1. Distinguish the front and back according to the color. The slightly darker color of the contact lenses is worn on the front side towards the outside of the eyeball, and the lighter color is on the back side and is worn close to the eyeball.

2. Use the shape to distinguish according to the front and back of the contact lenses. This is also the most commonly used method. If you put the contact lenses on the tips of your fingers, you can see that one side looks like a bowl and the other side looks like a plate.

The side like the bowl is the front, and the curve is different. Or you can see that the small area is the front and the large area is the tail.

3. Put the lens between the index finger and thumb and squeeze it, and close it inward, which is more elastic, and collapse outwards when the opposite side is inelastic.

1. Observation.

Put the contact lenses on your index finger as you would when you wear them, and then observe the edge of the contacts, if you look at them from the side, the curvature around the contacts is natural, showing a "U" shape, like a small bowl, that is, it is upright, and you can wear it directly. If it looks like an upside-down straw hat from the side, and the four sides of the contact lenses are slightly turned outward, it means that the contact lenses are reversed. The difference between positive and negative contacts is very weak, so you have to look closely.

Second, the floating and sinking method.

The easiest way to do this is to soak the lenses in the solution, float them up, and sink them up. But this method is not necessarily accurate, so it is better to observe it and feel it with your eyes.

3. How to wear it.

If there is an obvious foreign body sensation in the eye, or if you just feel uncomfortable and can't stop crying, then it must be wearing it backwards. After removing the contact lenses, put them back in the solution, turn them over, and put them back on. If there is still a feeling of foreign body, it may be that the contact lenses are damaged, and it is recommended not to wear them.

Fourth, the color method.

In fact, the color of the front and back of the contact lens is not the same, the reverse side is close to the eye, the color is much lighter, and the color of the outward side will be much darker.

The contact lenses are divided into three layers or two layers, if it is three layers, it is relatively difficult to distinguish, the front and back of the three layers of contact lenses are one color, two layers, the side towards the eyes is lighter than the outside side, if it is three layers, you have to bring it yourself, if you feel that the grind will be carried down and changed to a face band, until it is comfortable, it is generally two layers for easy identification.

The side that comes into contact with the eyes is concave.

Soaking in the solution will turn into a convex surface.