7-day reversal of myopia – day 3

wants to reverse myopia? Learn to measure

first. Welcome back.

are you ready to learn to measure your eyesight? This is an exciting thing. After reading this email, you will never see the glasses shop as before.

the thing is: if you can measure, you can quantify; If you can measure, you can begin to understand the essence; If you can measure, you can know what you really need and what excessive correction is.

there is another very simple way to measure your eyesight, that is, with a ruler. Let me teach you how to measure. (if you want to measure more accurately, you can print out a vision chart and order a test lens kit on Taobao for about 800 yuan. But even without these, you can use that ruler to calculate your accurate diopter).

Warning: don’t buy low-power glasses without fully understanding what you need to do. I’m not prescribing advice for you. I don’t offer medical advice. I’m just teaching you how to use biology and optics.

now go back to ruler and measurement.

actually, Tape measure is the best tape measure (usually sold cheaply in clothing stores or Taobao). You need a ruler or tape measure to measure the distance between your eyes and the page (or screen).

here are the steps of measurement:

take off your glasses and look at the screen or a book (preferably printed) start with your eyes closer to the book, make sure you can see the text on it, and then move back slowly until the text just blurs. You can stop at this position. The distance that causes the obvious change in clarity (blurring) is your visual distance. Record the distance between your eyes and the page in meters (or screen) distance.

now, I’ll tell you something. I was really surprised when I first learned about it.

diopter (the number that defines the strength of glasses) can be regarded as inversely proportional to the distance from the far point.

diopter = D * 100

for example, if your far point distance is 20cm (things outside 20cm begin to blur), then your diopter is 5D, and the diopter converted into glasses is 500 degrees. That means you need a 500 degree concave lens to achieve 1.0 vision.

this method is only applicable to ordinary myopia, and myopia caused by other reasons is not applicable (diseases, etc.).

You may ask, since myopia can be measured with a ruler, why does an optometrist have to go to great trouble? Simply put, optometrists generally measure higher degrees than you actually need. They usually look in a room with insufficient light and give you the maximum diopter correction. They don’t explain how your eyesight changes during the day.

it all makes sense once you try to measure and read the next few emails.

this is the first task. Take this task and you will have the motivation to act. To make sure you can do it, I’ll leave you some homework:

use this method to measure your left and right eye power (you can use books or screens) before work and study in the morning. Measure it again at noon and at night.

be sure to record your visual distance (these distances are closely related to your future vision recovery), and keep records.

The following is a record reference:

early: 0.35m to the left and 0.25m to the right

middle: 0.34M to the left and 0.24M to the right

late: 0.33m to the left and 0.22m to the right

remember, these are just examples. The number changes explain how you use your eyes and where the problem may be.

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