How do you distinguish between positive and negative contact lenses? Are there positive and negative

1. Appearance method: Put the lens on your fingers, if the edge is buckled like a bowl, it is the front, if it is spread out like a saucer, it is the back;

2. Extrusion method: put the lens between the index finger and thumb and squeeze it, the front side is closed inward, which is more elastic, and the reverse side collapses outward and has no elasticity;

3. Push method: put the lens in a doublet box filled with care solution, and push the lens with a lens clip, the front side is in a suspended state of the lens, which is easy to push, and the reverse side is sunk at the bottom of the box, which is not easy to push.

Generally speaking, the third of the above three methods is the easiest to identify.

Look at the edges, the front is bowl-shaped. The edge is inward. The reverse edge is flares outwards and is easy to distinguish. If you wear glasses and you are hungry with slides, it is the other way around.

It is not difficult to distinguish between the positive and negative of the contact lenses, there are several ways to distinguish the positive and negative of the contact lenses, for example, put the contact lenses on the belly of the fingers, look at the lens from the side when the U-shaped, the top edge will be a little like the feeling of the inner buckle, if it is reversed, it will be like a turned over straw hat brim will have a feeling of turning outward, from the size of the point of view can also be distinguished, usually the positive contact lenses have a smaller caliber, and the turned over contact lenses have a larger caliber.

1. The difference between positive and negative

If the contact lenses are positive, first of all, its shape will appear smaller, its diameter will be smaller in turn, the lens will be U-shaped when viewed from the side, and the caliber position will be retracted, if it is the opposite, the body size is larger than the land, the caliber is relatively large, and the side view will be a straw hat-shaped caliber edge turned outward, and the front contact lenses will be higher than the reverse contacts.

2. Put it on and feel it

If the lenses are worn backwards, there will be an uncomfortable feeling, the lenses worn backwards will not match the surface of the eyeball, and the foreign body will be felt, the lenses are easy to cause displacement, and there will always be tears when uncomfortable, at this time, you may wish to remove the lenses, turn the lenses over and observe, if the mouth of the lenses is smooth and round, it is positive, if the edge of the saucer is sharp, it is the opposite, if you find that the lenses are worn upside down, it is best to rinse and soak it with a care solution before bringing it again.

3. Depression depth

The front of the contact lenses is perfect in the U-shape, and its depth is relatively deep, and the caliber is sleek, which is easy to wear on the eyes, while the reverse side of the contact lenses is shallow and the caliber is turned outward, which will be uncomfortable to wear on the eyes.

Contact lenses are positive and negative. This product is divided into positive and negative sides, and if you wear it incorrectly, not only will it be particularly uncomfortable for your eyes, but it will also have an impact on your vision. Take out the contact lenses and place them on your fingertips, and if the perimeter is as uniform and rounded as the mouth of a bowl, then it proves that it is positive.

If the edge of it is upturned outward, it proves to be the opposite.

Although it is difficult to distinguish between the front and back of this product, it is easy to tell if you master a few of these tips. It is also possible to distinguish the front and back sides by extrusion. Place the lens between the two fingers, and then gently squeeze it inward, if it can be easily closed in the direction of the inward, and it is very elastic, then it is the front of the lead.

If the edge of the lens is turned outwards when the two fingers are forced, and there is no elasticity at all, then it proves to be the opposite.

Putting the lenses in a box with a care solution is also a good way to keep an eye on them. Gently move the lenses after placing them in the case, if the lenses move well and float on top of the solution, then it proves that they are positive. If the lens is very difficult to push and keeps sinking to the bottom of the box, then it proves to be the opposite.

It is very important to distinguish between the front and back of these glasses, because once you wear them backwards, it will not only affect your vision, make your eyes feel uncomfortable, but also seriously damage the service life of the lenses.

Put the lens on your fingers, such as the edge of the eggplant fruit is bowl-shaped round is the front, if the edge is upturned outward like a saucer, Zheng Kai is the reverse side of the trembling shirt. Contact lenses go to the official website of Meiyan to view.

It is not difficult to distinguish between the positive and negative of the contact lenses, there are several ways to distinguish the positive and negative of the contact lenses, for example, put the contact lenses on the belly of the fingers, look at the lens from the side when the U-shaped, the top edge will be a little like the feeling of the inner buckle, if it is reversed, it will be like a turned over straw hat brim will have a feeling of turning outward, from the size of the point of view can also be distinguished, usually the positive contact lenses have a smaller caliber, and the turned over contact lenses have a larger caliber.

1. The difference between positive and negative

If the contact lenses are positive, first of all, its shape will appear smaller, its diameter will be smaller in turn, the lens will be U-shaped when viewed from the side, and the caliber position will be retracted, if it is the opposite, the body size is larger than the land, the caliber is relatively large, and the side view will be a straw hat-shaped caliber edge turned outward, and the front contact lenses will be higher than the reverse contacts.

2. Put it on and feel it

If the lenses are worn backwards, there will be an uncomfortable feeling, the lenses worn backwards will not match the surface of the eyeball, and the foreign body will be felt, the lenses are easy to cause displacement, and there will always be tears when uncomfortable, at this time, you may wish to remove the lenses, turn the lenses over and observe, if the mouth of the lenses is smooth and round, it is positive, if the edge of the saucer is sharp, it is the opposite, if you find that the lenses are worn upside down, it is best to rinse and soak it with a care solution before bringing it again.

3. Depression depth

The front of the contact lenses is perfect in the U-shape, and its depth is relatively deep, and the caliber is sleek, which is easy to wear on the eyes, while the reverse side of the contact lenses is shallow and the caliber is turned outward, which will be uncomfortable to wear on the eyes.