Some people may say, I know that 5.0 is good vision, and 1.0 is also good vision, but together, I don’t know which one is better.
In fact, 5.0 and 1.0 are both recording methods for visual acuity, 5.0 is a standard logarithmic recording method, and 1.0 is a decimal recording method. The conversion rules for these two vision charts are as follows:
It can be seen from the table that vision 5.0 and vision 1.0 are the same vision, but they are expressed in different ways. Generally speaking, 1.0 and above is normal vision.
This problem is understood, let’s look at another question about the degree of contact lenses.
Contact lenses are not the same as spectacles
Glasses and contact lenses The degrees are different, why are they different?
Because when wearing glasses, the cornea of the eye has a little distance from the lens, and the contact lens is directly worn on the cornea, which is caused by this distance.
Generally speaking, the distance between the rear vertex of the frame glasses and the cornea is about 12 mm when the yellow people wear frames. Below 400 degrees, the difference can be ignored due to the small difference.
How about contact lens prescriptions?
The degree of contact lenses has a conversion formula, contact lens diopter = eye diopter ÷ (1-0.012 × frame glasses diopter), if you don’t convert it directly Below:
400 degrees of myopia, 375 degrees of contact lenses
500 degrees of myopia, 475 degrees of contact lenses
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Myopia 600 degrees, contact lens degree 550 degrees
Myopia 700 degrees, contact lens degree 650 degrees
800 degrees of myopia, 725 degrees of contact lenses
900 degrees of myopia, 800 degrees of contact lenses
Myopia 1000 degrees, contact lens degree 875 degrees
Myopia 1100 degrees, contact lens degree 975 degrees
In fact, myopia can be corrected by surgery. Now the more popular myopia correction surgeries are femtosecond, SMART all-laser, ICL lens implantation, etc. People with different conditions are suitable for different surgeries.