How do you distinguish between front and back? How to distinguish the front and back of contact lens

The front and back of the contact lens are actually very different, put the lens on the fingertip, and observe the lens at the edge, in a bowl, deep depression for the front. It is dish-shaped, and the shallower depression is the opposite side. Look at it a few more times and you'll understand.

There is also a way, if it is uncomfortable to wear on the reverse side, take it off and wear it again, and then look at the state of the lens.

The difference between the front side and the back side is that the front side looks better than the back side, and the front side is more clear.

The front is relatively round, and the reverse will be a little flat, just look at it before wearing it.

In the appearance method, put the lens on the finger, if the edge is buckled like a bowl, it is the front, and if it is spread out like a saucer, it is the back.

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In the squeezing method, the lens is squeezed between the index finger and thumb, and the front side is closed inward, which is more elastic, and the reverse side collapses outward and has no elasticity.

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Push method, put the lens in a double box filled with care solution, use the lens clip to push the lens, the front lens is suspended, easy to push, the reverse lens sinks at the bottom of the box, it is not easy to push.

I haven't worn contact lenses, so I don't know, there should be an instruction manual!

How to distinguish the front and back of contact lenses? So it's that simple!

How to distinguish the front and back of contact lenses? So it's that simple!

Place the lens on your fingertip and look at the side:

This is frontal with the edges facing inward, like the shape of a bowl.

This is reversed, with the edges facing outwards and resembling the shape of a saucer.

There are three common ways to distinguish between the front and back of contact lenses:

1. Gently place the contact lenses on your fingertips to observe, and the edge of the lens is a bowl-shaped perfect circle, which is the front. If the edge of the lens is turned outward, then it is reversed.

2. Place the contact lenses between the index finger and thumb and squeeze gently, if they are closed inward and more elastic, it is the front. If it's collapsing outwards and it's not resilient, it's the opposite.

3. Put the contact lenses in the box with the care solution, and gently push the contact lenses with tweezers, if the lenses are suspended in the care solution, and it is easy to push with tweezers, then it means that it is positive. If the contact lenses are sunk at the bottom and are not easy to push with tweezers, then it means that they are reversed.

Generally speaking, when the contact lenses are gently placed on the fingertips, the edge of the lens is a bowl-shaped perfect circle, which is the front. If the edge of the lens is turned outward, then it is reversed. Or if you place the contact lenses on the tip of your finger, you can see that the bowl shape is the front and the reverse is the opposite.

How to distinguish between the front and back of contact lenses:

1. Appearance method.

Place the contact lenses on the index finger of the right hand, raise them to the level of the eyes, and observe the edge of the lens, if the edge is bowl-shaped and buckled inward, it is positive, if the edge is dish-shaped, turned outward, it is reversed.

Features: The appearance method is the most convenient, simple, and the most commonly used one, but beginners may be a little difficult to distinguish, however, as long as you try more, it will become the most commonly used one for you after you are proficient.

Second, the extrusion method.

If you squeeze the lens between your index finger and thumb, the front side will close inward and be relatively elastic, while the back side will collapse outward and will be inelastic.

Features: Easy to identify, but not easy to operate, novices may also break the lenses.

3. Promotion Law.

First of all, put the lenses in the lens box with the care solution, and use the lens clip to push the lenses, if it is the front, the lens will appear suspended and easy to push, and the reverse side will sink the lens at the bottom of the box and it is difficult to push.

You can distinguish between positive and negative by looking at the color and shape of the contact lenses.

People with darker colors and smoother surfaces face the outside of their eyes, while people with lighter colors and less smooth surfaces face their eyes; In addition, the back of the contact lens is disc-shaped concave, while the front is bowl-shaped.

The contact lenses with power in the left eye correspond to the contacts in the left eye, and the contacts with the power in the right eye correspond to the contacts in the right eye. If there is no power or the power on both sides is the same, you can wear it freely regardless of whether it is left or right.

Precautions for the use of contact lenses:

1. Do not choose a mirror box with a concave and convex pattern on the bottom surface.

The case is deep enough to hold enough care solution to keep the contact lenses from deforming. The bottom of the case has concave and convex, patterned, easy to deform the contact lenses, maybe you can't see the change with the naked eye, but it is really uncomfortable to wear.

2. The contact lenses should not be soaked in the care solution for a long time.

Many people just buy contact lenses and don't wear them often, so they plan to fill the care solution into the original glass bottle and seal it, which is actually wrong. The antibacterial effect of the care solution will disappear after a long time, and it will crystallize after volatilizing the water, so it is not possible to soak the contact lenses for a long time, and it is necessary to replace the care solution with a new one every week.

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.