How to measure myopia degree

It is best to go to a professional eyewear store to measure your eye degree, so that the measured value will be more accurate. But we can also measure our eyes at home. First, we need to prepare a ruler. Although the degree measured in this way is not very accurate, it can give an approximate degree. Do not look directly at the light source and pay attention to using your eyes properly. Don't overstrain yourself, as this is bad for your eyes, and don't rely too much on this value.

1: A ruler;

2: A well-lit environment;

3: A clear photo or picture with details on it;

Test steps:

Place the photo on a horizontal plane at eye level, with the photo plane perpendicular to your line of sight;

Adjust the distance between the photo and your eyes until you can see all the details of the photo clearly;

Record the vertical distance between the photo and the pupil of the eye at this time (in CM);

Note: If testing monocular vision, cover the other eye with a small medium gray object;

If both eyes are used at the same time, the combined vision of the two eyes is tested, which is generally higher than the vision of one eye.

During the entire test process, the eyes should be protected from direct light and sufficient light should be ensured in the photo; otherwise the test results will be inaccurate.

Do not let objects touch your pupils directly, and be careful to protect your eyes.

Visual acuity calculation:

Naked eye degree = -10000/distance

For example: Test distance = 40.0cm

Then degree = -10000/40.0

= - 250(degrees)

That is, the visual acuity of this eye is 250 degrees myopia.

It should also be noted that if there is astigmatism at the same time, the tested degree will be inaccurate.

This method gives a comprehensive degree, which will be higher than the simple myopia degree. If needed

When fitting glasses, you should consult a professional organization for testing.

The degree of myopia can be roughly judged by the eye chart. If the exact degree is required, it will require an optical instrument to check. According to your medical history, in this case, you are considered to be myopic. It is recommended that you go to the ophthalmology department of a regular hospital for a detailed examination and determine the degree of myopia based on the results. This is my suggestion for your current condition, you can refer to it.

The reason you can't see clearly is because of your myopia, and the reason you can see clearly when you cry is because the tear film has changed the refractive power. You started to be nearsighted in elementary school. Generally speaking, the degree of myopia will increase with age before you become an adult.

Guidance:

In order to determine the degree of myopia, you must dilate your pupil to perform an eye test to distinguish between true and false myopia. Pseudomyopia does not require wearing glasses, just pay attention to eye hygiene and have regular check-ups. People with true myopia need to wear glasses. Including frame glasses, orthokeratology lenses, etc.

Most pharmacies sell eye charts, and you can do the test at home, but this can only give you a rough idea of ​​your vision. If you want to make an accurate judgment, you still need to go to an ophthalmologist for an eye test to confirm it.