Abstract: if there is a temporary problem in the regulation function of lens and ciliary muscle, resulting in the inability of visual images to focus on the retina, but the length of ocular axis does not change, this is pseudomyopia.
what is myopia?
in the relaxed state, the parallel light is focused in front of the retina after passing through the ocular refractive system, which is called myopia. Myopia is also called myopia, because this kind of eye can only see near, not far. When the eye is at rest, the parallel light from an infinite distance passes through the refraction of the refractive system of the eye, gathers into a focus in front of the retina, and forms an unclear image on the retina. The far vision is significantly reduced, but the near vision is still normal.
are, in short, to see things that are near and things that are far away.
eyes can be regarded as an optical instrument. The distance from the cornea to the retina is called the ocular axis.
if there is a temporary problem in the adjustment function of lens and ciliary muscle, the visual image cannot be focused on the retina, but the length of ocular axis does not change, this is pseudomyopia.
however, if the axial length of the eye is lengthened and the position of the retina retreats, resulting in the inability of visual images to focus on the retina, this is true myopia, which can also be called axial myopia.
generally speaking, pseudomyopia can recover vision through rest or some medical means, but true myopia is not so easy to recover.
identify true and false myopia. In addition to optometry in the hospital, a simple method can hang an international standard visual acuity chart at a distance of 5 meters. First determine the visual acuity, then wear 300 degree presbyopic glasses and look into the distance. A cloud like scene will slowly appear in front of you. Take off your glasses half an hour later and check your visual acuity. If your visual acuity is enhanced, it can be considered as false myopia; If your eyesight is still or decreased, you can do it once a day and repeat it for three consecutive days. If your eyesight is still not improved, it can be determined as true myopia.
for some teenagers and children, their adjustment ability is very strong. The visual acuity decline caused by ciliary muscle adjustment spasm caused by long-time close learning is often pseudomyopia. After a period of rest, they can return to normal. Children with glasses for the first time must have mydriasis and optometry to eliminate the factors of pseudomyopia.
completely paralyze the ciliary muscle of the eye through mydriasis. For pseudomyopia, the vision is restored due to the effect of mydriasis drugs, relax the fatigue caused by excessive tension of the ocular muscle for a long time, and optometry is carried out under the condition of removing the regulatory effect, so as to obtain the real refractive state of the eye. After mydriasis, children will feel afraid of light and unclear near objects. It is normal to recover after a period of rest.
if they match glasses without professional testing, pseudomyopia is likely to become true myopia, and there is no room for recovery.
of course, if it is confirmed to be true myopia after examination, you must wear glasses.
do not wear glasses in time, which makes the eyes unclear for a long time. The action of squinting will squeeze the eyeball and prolong the eye axis, accelerating the development of myopia. Correct ametropia by wearing glasses of appropriate degree, so as to control the rapid decline of vision.