How to tell the front and back of contact lenses?

As the name suggests, contact lenses are a type of glasses that cannot be seen from the outside. Many people wear them because they do not affect the appearance like traditional frame glasses. They are often worn close to the eyeballs, so they need to be made of special materials. Because of its special characteristics, you must not treat it like ordinary glasses. So how do you distinguish the front and back of contact lenses during actual wearing?

Because contact lenses are very light and small, there is not much difference if they are turned inside out. Many people are confused about how to tell the front and back of contact lenses. In fact, there is a very simple way. You can gently place the contact lens on your right hand, let the lowest point of the lens stick to your finger, and let the edges of the lens naturally rise.

If it is positive, then when viewed from the side, the lens is "U" shaped, with the top edge slightly curled inward. This smooth curve means that the contact lens is now placed forward and can be worn directly.

If it is the reverse side, it will look like a straw hat from the side, and you will need to put it back into the nutrient solution, turn it over and wear it on your eyes again.

Precautions

Although contact lenses have many benefits, they also have certain harm to the eyes.

When buying glasses, you must pay attention to the water content, which should not be too high or too low. Because of wearing glasses for a long time, the lenses will absorb moisture from the eyeball, and in severe cases it may cause diseases such as dry eyes.

You cannot wear contact lenses continuously because lenses also need rest and breathe air. Although there are no blood vessels on the lenses, they breathe with the help of air and surrounding tissues. If you wear glasses continuously, it may cause symptoms such as abnormal metabolism of the eyes and a sharp drop in resistance.

Wearing contact lenses for a long time may cause corneal aging, so it is appropriate to wear framed glasses when you go home or take a break so that the cornea can get proper rest.

If there is a problem with the contact lenses, they must be replaced promptly. If the lenses are cracked, they must be replaced promptly. In severe cases, it may cause varying degrees of irritation to the glasses and damage the surface of the cornea.

The above is a brief introduction to how to distinguish the front and back of contact lenses and the basic knowledge and precautions of contact lenses. I believe everyone has a deep understanding of how to distinguish the front and back of contact lenses. Here, experts remind everyone that although contact lenses are comfortable and beautiful to wear, long-term wearing will cause excessive eye fatigue, so be sure to give the glasses enough rest time.