What counts as pseudomyopia and what counts as true myopia

Pseudomyopia is usually caused by eye fatigue caused by overuse of the eyes. The eyes are always in a state of close reading, which will cause the ciliary muscle to be in a state of tension, and after a long time, the adjustment power of the eyes will appear to decline for a short time, this process is called the process of pseudomyopia, and it will also cause the decline of naked eye vision, but after the refraction examination, there will be no myopia. For pseudomyopia, it is mainly necessary to start from eye habits, usually need to maintain reasonable eye habits, avoid excessive eye use, and reduce the time of near eye use, such as using electronic products such as computers and mobile phones.

In addition, it is necessary to increase outdoor time in normal times, which can effectively prevent pseudomyopia from developing into true myopia. Generally, after reasonable eye habits, pseudomyopia can return to normal.

1. The difference between true myopia and pseudomyopia: One of the differences between true myopia and pseudomyopia is whether vision can be restored naturally, and if it can be recovered, it is pseudomyopia. If it can't be recovered, it's true myopia.

The reason why pseudomyopia will recover is because the eyeball has not yet become longer, so as long as you do a good job and pay attention to eye habits, vision can still be restored. If pseudomyopia is not corrected in time, then it is easy to develop into true myopia, and no matter what efforts are made, there is no way to return to normal.

2. Methods to distinguish true myopia from pseudomyopia:

If you suspect that you have true myopia, you can go to the hospital for relevant examinations, you can do an optometry, if the verified report is not myopia, farsightedness has astigmatism, and there are signs of recovery of vision, then it is pseudomyopia. If the patient has lesions such as dilated pupils, paralysis of the ciliary muscle, etc., it means that the length of the patient's eye axis has changed, and it is true myopia. 

3. Early symptoms of myopia:

Distance vision is relatively poor, compared with normal strength, myopic patients have significantly weaker farsightedness, and if the degree is higher, then farsightedness is even worse. Many patients read for a long time, the font begins to change, overlapping, and people feel a little dizzy, which is caused by excessive eye fatigue, resulting in adjustment failure, forming early myopia symptoms. If there is dryness, burning, itching, etc., then pay attention to good maintenance to avoid migraines.

There are three main ways to distinguish between true myopia and pseudomyopia:

1. The cycloplegic method is recognized as the most reliable method for differential diagnosis, which lies in the relaxation and adjustment of the ciliary paralysis drug, so that the ciliary muscle is relaxed, and the eyes are in a static refractive state, and then the visual acuity and refraction are checked. You can use 1% atropine eye drops to check the naked eye vision before and after the drops, if the visual acuity remains unchanged after dilation, the vision increases for pseudomyopia, the refraction of myopia is true, and the refraction without myopia is false.

Second, the cloud and fog method allows the patient to look at the distance with + spherical lenses in both eyes at the same time for a few minutes, and then remove the lenses, and immediately check the naked eye vision.

3. Dynamic imaging method. The cloud and dynamic imaging methods are not very accurate, so only cycloplegia is the most reliable method to distinguish between true myopia and pseudomyopia.

Myopia can be divided into true myopia and pseudomyopia, there are many ways to distinguish true myopia from pseudomyopia, the clinical practice often uses the method of cycloplegic optometry, and after the application of cycloplegic drugs, understand the true myopia state.

Pseudomyopia is a condition in which refraction is natural and cycloplegia may be emmetropia or mild myopia. In the natural state, the refraction results after cycloplegia are all myopia, which is called true myopia. There are other examination methods to distinguish between true myopia and pseudomyopia, such as axonometry, fundus development status, and formal state of corneal curvature, which are all reasonable methods and ways to objectively understand the distinction between true myopia and pseudomyopia.

Optometry is a scientific, reasonable and reliable method to understand the true power of the child and avoid wearing inappropriate altitude glasses too early. If myopia occurs, you should go to a regular medical institution for a reasonable examination, including eye, corneal curvature, eye axis, fundus examination and dilated pupil examination to distinguish between true myopia and pseudomyopia.

If the child squints, blinks, tilts his head and sees, etc., he must go to the hospital to establish a refractive file to check the child's true power, and understand whether the child is true and false myopia, so as to avoid missing the diagnosis, misdiagnosis or wrong wearing of inappropriate glasses for the child, resulting in too fast or inappropriate methods.

To distinguish true and pseudomyopia, dilated refraction can be done. If the vision is normal after the dilation, the refraction without myopia is pseudomyopia, if there is still myopia after the mydriasis, it is true myopia, if it is pseudomyopia, you can rest the eyes more, use topical eye drops to dilate the mydria, relieve the ciliary muscle spasm to **myopia, may return to the original normal state. If it is true myopia, it can only be corrected with glasses.

Usually develop good eye habits, such as eyes one foot away from books, do not read and study in a dark environment, watch for nearly an hour or so, rest for a while, look less at mobile phones, computers and other electronic products, do not over-fatigue your eyes, you can do more outdoor activities, eat more food that is good for your eyes.

The degree of pseudomyopia is generally not more than one, common in childhood, mainly caused by long-term continuous fatigue of the eyes caused by ciliary muscle spasm, by reducing the eyes in time, and developing good eye habits, and at the same time using mydriatic drugs for **, can make pseudomyopia return to normal. It is not easy to recover after the formation of true myopia, which is manifested as a relatively high degree of myopia, and the results of the refraction examination are not reduced after the dilation of the pupil, and it is necessary to wear glasses to make the corrected visual acuity of the eye reach normal, and reduce the continuous growth of eye control.

Pseudomyopia is caused by long-term close use of the eyes, such as reading time, especially looking at mobile phones for too long, the muscles in the eyes can not be relaxed, at this time, the ciliary muscle in the eyes spasm, and myopia will occur in the long run.

When complete true myopia does not occur, if the patient relaxes the ciliary muscle in time, he can get a relief, which is called pseudomyopia. What is the difference between true and false needs? It is necessary to do dilated refraction, dilate the pupils with cycloplegic agents, artificially remove the false factors, so that the eyes are in a completely relaxed state, and the results of the optometry we get are true myopia.

The difference between true myopia and pseudomyopia is that pseudomyopia is a reversible state, and to distinguish between true and false myopia, you need to go to the hospital for dilated refraction.

There are two states of myopia:

1. True myopia.

2. Pseudomyopia.

These two states of myopia are different.

Specifically, the differences between the two are as follows:

1. The diopter of the lens of true myopia has undergone irreversible changes.

True myopia occurs because of a change in the diopter of the lens. ......Moreover, this change is permanent and irreversible.

It is precisely because of the irreversible change in the refraction of the lens that true myopia cannot be restored to normal vision through conditioning. ......Therefore, it is called "true" myopia.

2. Pseudomyopia is caused by fatigue of the ciliary muscle.

Pseudomyopia occurs because of fatigue of the ciliary muscle, which causes changes in the refractive power of the lens. ......When the fatigue of the ciliary muscles recovers, the lens refractive power can return to normal, and the symptoms of myopia will disappear.

It is precisely because the ciliary muscle fatigue can be recovered through conditioning and the myopia symptoms disappear that this kind of myopia is called "false" myopia.

3. True myopia cannot be restored to normal vision through conditioning.

4. Pseudomyopia can be restored to normal vision through conditioning.

5. If pseudomyopia is not regulated, it will transform into true myopia.

The above is the difference between true myopia and pseudomyopia.

As for the method of distinguishing true myopia from pseudomyopia, the mydriatic method (cycloplegic method) is generally used for examination.

Using this method, the ciliary muscle can be paralyzed, so that the ciliary muscle can be completely relaxed, at this time, if the lens refractive power can return to normal, and the vision can return to normal, it proves that the person has pseudomyopia. ......If the lens refraction is still abnormal after mydriasis, and the vision is still myopia, it proves that it is true myopia.

At present, this is the most common and accurate way to determine true myopia and pseudomyopia.

Pseudomyopia is functional myopia in which the axial length is normal, whereas true myopia is an organic lesion in which the axial length is usually longer.

The method of distinguishing true myopia from pseudomyopia refers to subjective refraction, which includes optometric refraction and dilated refraction. Through subjective refraction, the adjustment ability of the eye itself can be removed, and the refractive state of the eye can be truly displayed.

The specific identification methods are as follows:

1) Mydriatic method: pseudomyopia - after the use of atropine, the refractive power of myopia disappears, and it appears as emmetropia or hyperopia; True myopia - the degree by which the refractive power of myopia has not decreased or decreased after the use of atropine;

(2) Imaging method: let the patient wear a convex lens with a higher power and look at the eye chart 5 meters away, which can relax the ciliary muscle in a spasmodic state and eliminate the adjustment effect. At first, the patient will feel blurred vision, after a few minutes, it will feel a little clearer, and then gradually reduce the power of the convex lens, if the visual acuity returns to normal or has a significant improvement compared with the pre-test visual acuity when decreasing to a flat lens without power, it proves that it is pseudomyopia.

To determine the condition of eye myopia, it is necessary to go to a professional hospital to perform unaided visual acuity, slit lamp microscopy, ocular position examination, optometry examination, binocular vision function examination, axial length examination, corneal curvature examination and fundus examination to determine whether true myopia or pseudomyopia.

It is best to go to the hospital to do some mistakes, examinations, and let the doctor make a correct diagnosis for you. You can't judge for yourself. so as not to affect your own body.

Below 200 degrees is pseudomyopia.

More than 200 degrees is true myopia.

The main difference between pseudomyopia and true myopia is that after cycloplegia or full relaxation of the eye muscles, pseudomyopia can disappear, but true myopia cannot disappear. Pseudomyopia is caused by excessive use of the eyes or excessive vision of the ciliary muscle spasm, after spasm, our focus can only be fixed on relatively close objects, and can not see distant objects clearly, just like the lens of our camera, its focus ability can only be adjusted in the macro aspect, and the distant focus can not be adjusted, that will produce pseudomyopia. After adequate cycloplegia, which is what we often call pupil dilation, after the ciliary muscle is relaxed, the ciliary muscle spasm in the eye will be relieved, and you will be able to see things in the distance and things in the near area, so pseudomyopia can be treated with drugs.

However, true myopia is because the eye axis becomes longer, which has nothing to do with the eye ciliary muscle spasm, so true myopia cannot be relieved after mydriasis or drugs**.

True myopia, also known as axial myopia, is caused by congenital or acquired factors (such as not paying attention to eye hygiene), which makes the anterior and posterior diameter of the eye (i.e., the eye axis) longer than the normal average of 24mm, resulting in the focus of parallel light rays in front of the retina after the eyeball is incident and the image cannot be clear.

True myopia is myopia caused by the elongation of the eye axis or the excessive curvature of the cornea and lens, and the refractive power of myopia does not decrease after resting or relaxing the ciliary muscle with medication, or the degree of myopia is reduced <.

Pseudomyopia: Functional myopia due to poor eye accommodation.

It is more common in adolescents and children, and those who use their eyes for a long time at close range, generally below 150 degrees, blurred vision and unstable symptoms, can be restored to normal by active intervention, and continuous development can be "true" myopia.

Pseudomyopia is caused by the continuous contraction and spasm of the ciliary muscle, the thickness of the lens increases, and the vision is blurred.

Medications, physical therapy equipment, or the patient's own eye muscle strengthening exercises can relax the muscles, relieve fatigue, and restore vision to a normal state.

If pseudomyopia is not relieved in time, it will eventually lead to the enlargement of the eye axis and become true myopia.

True myopia, also known as axial myopia, is caused by congenital or acquired factors (such as not paying attention to eye hygiene), which makes the anterior and posterior diameter of the eye (i.e., the eye axis) longer than the normal average of 24mm, resulting in the focus of parallel light rays on the eyeball in front of the retina and unable to image clearly.

Pseudomyopia is mainly caused by eye fatigue caused by overuse of the eyes. Under normal circumstances, the degree of pseudomyopia will disappear after the mydriasis is passed, and if it is true myopia, the degree of myopia will not disappear after the mydriasis is passed.

Therefore, if you want to determine true or false myopia, remember to go to a regular ophthalmologist for dilated refraction. Dilated pupils can relieve eye fatigue and relax the muscles that regulate tension, so that the refraction of refraction is accurate.