Define myopia is to point the eye looks, not be an obvious thing, but she nearly things symptoms. In refractive static, under the premise of distant objects in the retina can converge, and the retina formed before the focus, therefore cause visual deformation, lead to objects from a distance blurry. Myopia, through narrow her eyes can restrict the light of the incident, thus reduce like poor, so that they can see it clearly. Myopia originally meant to narrow her eyes. Myopia can be through the wear concave lens (concave through glasses) to correct.
Myopia is also a kind of disease, a kind of eye disease. Parallel light rays pass through the eye refractive system inflectional. The falls on the retina of before a refractive status, so myopia can't see the distant goal. If the goal is to the eye moved in a light in a certain degree of missing so irritating eyes, forming the focus back, when the target is closer to a point on the eyes, from the point of the eye position more closely, the deeper the degree of myopia.
Define myopia classification
Myopic degree classification(1) 3.00 D (300 degrees) be less than, called mild myopia.
(2) 3.00 D ~ 6.00 D (300 degrees and 600 degrees) persons for moderate myopia.
(3) 6.00 D (600 degrees) or more is high myopia, and allege illness as the reason for rational myopia.
Myopia refractive component classification
(1) axial nearsightedness, is because the eyeball caused by excessive development between the front axle.
(2) Curve for sexual myopia, is because the cornea or crystal curved surfaces have been caused by strong.
(3) refractive willfulness nearsightedness, is the refractive interstitial refractive rate caused by abnormal.|
Myopia regulatory classification
Pseudo myopia additionally called for regulatory nearsightedness, is by far not to relax when see adjustment caused by it and refractive composition change are the true myopia is fundamentally different.
Define myopia - Pseudo myopia
Pseudo myopia is relatively true myopia is concerned, the real myopia is to face up to the eye refractive system is a stationary state, that is, remove the adjustment function, the eye at the remote distance in limited within. In other words, myopia is due to congenital or acquired factors and cause eye anteroposterior length, parallel light into the eye in the retina after formed by focus, cause inspect content fuzzy, and pseudo nearsightedness, is in on distant objects with part of the supervisory role to participate in, common in young students see things in nearly, because as the extent of the regulation compelling and continuous time is too long, cause of persistent subjects contraction, cause adjust nervous or conditioning section convulsion, thus in the long time reading and writing to see far, can't soon relax regulation, and cause dizziness. Eyes bulge, declining eyesight vision fatigue symptoms. This because of the eye QuGuangLi enhancement, make the eye in myopia state, is called spurious myopia. Pseudo myopia and true myopia look at symptoms have vision fatigue, far JinShiLi good eyesight and features. Nonetheless, pseudo myopia belongs to functional change, no eye anteroposterior variable-length problem, just adjust spasms, the paralysis medicine point after subjects eyes, most of it can be converted into farsightedness or to face up to the eye, if according to true myopia wearing a myopic lens treatment, eyes will feel extremely uncomfortable, because it did not remove regulation convulsion, and even lead to the risk of developing myopia.Define myopia - True myopia
True myopia: also called Shaft sex myopia. Its refractive mesenchymal inflectional force is normal. Eye axis diameter extension is before and after. Distance light after starting imaging in before the retina.True myopia mainly for clinical characteristics:
(1) The myopic degree for more. High Myopia. Happen. Development time is long. And patients look unusual degree of eye the convex.
(2) The true myopia is hard to adjust itself to recover.
We think the true myopia and pseudo myopia biggest difference lies in the refractive interstitial (corneal. Waterproof. Lens. Vitreous) refractive normal. And a longer view axis. The main reason is that long-term close looks matter.
