How to distinguish the front and back of contact lenses

Many people will encounter a problem when wearing contact lenses, that is, the difference between the front and back of the contact lenses, because sometimes the color of the front and back may be wrong, so you should pay attention to observe. Usually if it is the back, it will look like an upside-down straw hat from the side.

1. The first method is to place the contact lens lightly on the tip of your right index finger , with the lowest point touching the tip of your finger, allowing the surrounding areas to naturally curl up. If it is positive, the lens is "U" shaped when viewed from the side, with the top edge slightly inward. This smooth arc means that the contact lens is now placed in the front and can be worn directly.

2. If it is reversed, it will look like an upside-down straw hat from the side, that is, the top edge is turned outwards, like the brim of a straw hat. At this time, you need to put it back into the nutrient solution, turn it over, pick it up again, put it down, and put it on again. It is best not to turn it over directly in your fingers

3. Generally speaking, a normal lens viewed from the side (parallel to the line of sight) is a full bowl shape with a very smooth curvature. If the lens is reversed, it looks more like a plate from the side, with the edges looking a bit turned outward, and the overall curvature is not as large as when viewed from the front, and it feels a bit flat.

4. You can make more comparisons between these two situations . You will be able to tell the difference naturally over time. If the lens is reversed, it will feel uncomfortable when worn in the eye.

5. Place it on your fingertips . If it is the front side, it looks like a bowl, with smooth and rounded edges; if it is the back side, it looks like a plate, with sharp edges.