How to distinguish between true myopia and false myopia?

Abstract: pseudomyopia is the early stage of true myopia. Do not pay attention to eye hygiene and use eyes too close, resulting in ciliary muscle spasm, so that the lens is often in a continuous convex state and the refractive power is increased, that is, the so-called pseudomyopia. For a long time, it will inevitably lead to the lengthening of the ocular axis and the transition from pseudomyopia to true myopia.

myopia is divided into true myopia and false myopia. Myopia must be diagnosed and treated as soon as possible in order to avoid greater harm. Then we must first distinguish between true myopia and false myopia in order to have more targeted treatment, because true and false myopia are completely different situations. Please see the following introduction for details.

pseudomyopia patients with

pseudomyopia will have excessive contraction of ciliary muscle and even cause spasm when they look at nearby objects or work at close distance for a long time (such as reading and writing). At this time, the convexity of lens will increase, the bending force will increase, and the distant objects will be blurred. However, the patient’s eyeball itself has not been prolonged. It can be recovered if appropriate treatment or attention is paid to eye hygiene, and bad habits such as long-term persistent over looking close are changed.

the difference between pseudomyopia and true myopia

generally speaking, there is no obvious boundary between pseudomyopia and true myopia. From the perspective of refractive system, whether true myopia or false myopia, it is the result of too strong refractive power. After the parallel light enters the eye, the imaging focus falls in front of the retina. However, pseudomyopia can return to emmetropia after appropriate treatment.

pseudomyopia is the early stage of true myopia. Do not pay attention to eye hygiene and use eyes too close, resulting in ciliary muscle spasm, so that the lens is often in a continuous convex state and the refractive power is increased, that is, the so-called pseudomyopia. For a long time, it will inevitably lead to the lengthening of the ocular axis and the transition from pseudomyopia to true myopia. There are three differential diagnosis methods of

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:

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(1) ciliary muscle paralysis method:

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are to relax and adjust the ciliary muscle with ciliary muscle paralysis drugs to make the eye in a static refractive state, and then check the visual acuity and optometry. Check the naked visual acuity under the eyelet microscope before and after dribbling. If the visual acuity remains true myopia after mydriasis, the visual acuity increases to false myopia; The diopter with myopia is true, and the diopter without myopia is false. This is recognized as the most reliable method of differential diagnosis.

(2) cloud method:

let the patient wear + 3.0d spherical lens at the same time, look at the distant object for 3 minutes, then remove the right lens, and immediately check the naked eye vision. Those with improved vision are false, and those without improved vision are true; Then check the left eye with the same method. This method is not very accurate.

(3) dynamic retinoscopy:

do not need mydriasis, ① check the far and near naked vision of both eyes first. Eye diseases with poor far vision, normal near vision and no other eye diseases affecting vision shall be identified. ② The doctor and the patient sat face to face in the dark room. ③ The patient wore a test frame and placed + 2.25d ball glasses in both left and right eyes. ④ The patient’s eyes are fixed on the visual mark on the ophthalmoscope at the same time (No. 5 words or words with few strokes such as large, small, upper and lower are pasted on the side of the reflector, which are illuminated by the slit light near the ophthalmoscope); ⑤ Perform dynamic examination at the same position at a distance of 33 cm. The results of

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determined that: ① the patient with reverse movement in all radial directions is true myopia. ② Each radial direction is clockwise or stationary, or one radial clockwise and the other radial stationary is frontal or hyperopia. Because its performance is myopia, it is pseudomyopia; ③ Mixed astigmatism occurs when one radial direction is reverse movement and the other radial direction is forward movement or immobility.