How much lower is the degree of contact lenses than frame glasses?

Contact lenses and frame glasses are both tools for correcting myopia. Generally speaking, the degree of contact lenses is lower than that of frame glasses. If you want to wear contact lenses, you also need to go to a regular ophthalmology hospital to wear them.

1. Many people believe that the degree of frame glasses and contact lenses are exactly the same, and often wear contact lenses according to the degree of frame glasses. In fact, there is a clear difference between the two, and the difference becomes greater with increasing degrees.

2. Generally speaking, the degree of contact lenses is lower than that of frame glasses. Taking the eye test result as an example, if your myopia is 450 degrees, the contact lenses you need to wear will be 25 degrees less, so you only need to wear 425 degrees. It should be emphasized that the difference between the two has little effect on lenses below 400 degrees and can be ignored. For lenses above 400 degrees, the degree needs to be increased or decreased.

3. There is actually a conversion formula between the degree of contact lenses and the degree of frame glasses, that is, the refractive power of contact lenses = the refractive power of frame glasses ÷ (1-0.012×the refractive power of frame glasses). 1 diopter is equivalent to 100 degrees as we usually say. The refractive power of myopia is a negative number, and the refractive power of hyperopia is a positive number. According to this formula, the correct contact lens power can be calculated. If there is no corresponding degree after conversion, you can choose the closest lower degree. For example, 800 degrees minus 75 degrees equals 725 degrees. If there is no 725 degrees, then 700 degrees should be selected, and so on.

4. Therefore, it is best to go to a regular ophthalmology hospital to get contact lenses . If you go to an eyewear store, you should use the formula to calculate the appropriate degree in advance before purchasing. Wearing contact lenses can easily cause dry eyes. At this time, you can choose eye drops containing moisturizing and nutrient ingredients to relieve discomfort such as dryness, astringency, itching, pain, swelling and foreign body sensation in the eyes, but you must obtain a doctor's consent before use.