There is a conversion formula between contact lens degree and frame lens degree, and the results obtained according to the formula can be summarized as follows:
1. If the myopia degree is below 400 degrees (excluding 400 degrees) and there is no astigmatism, you can directly choose the contact lens degree according to your own frame degree, because the myopia degree is low and there is no need to convert it when matching contact lenses.
2. If myopia is more than 400 degrees, it needs to be reduced according to the degree of different stages. 400 degrees to 550 degrees minus 25 degrees, 550 to 725 minus 50 degrees, 750 to 850 minus 75 degrees, 875 to 1000 minus 100 degrees. Because the frame glasses have a certain distance from the eyeball and the contact lenses are directly attached to the eyeball, the eye distance is a bit different.
3. If there is no certain degree in the conversion of contact lens degrees, you can choose a similar degree, for example, 800 degrees MINUS 75 degrees is 725 degrees, and if there is no 725 degrees, you can choose 700 degrees, and so on. Generally speaking, it is more comfortable to choose a lens with a lower degree than to wear a lens with a higher degree.
4. If the eye has astigmatism, and the astigmatism degree is below 150, you can add half of the astigmatism degree to the myopia degree and then convert it.
5. If the astigmatism degree exceeds 150, you need to prepare special astigmatism contact lenses.
The above is some knowledge about the degree conversion of contact lenses, hoping to help everyone. If you don't want to change it yourself, you can also change your optometry degree (that is, frame degree)