Sunday, November 4, 2012

How to distinguish genuine myopia and pseudo-myopia?

How to distinguish genuine myopia and pseudo-myopia?
Genuine and pseudo-myopia are shown as the strength of long sight drops, near-sighted strength is good. Pseudo-myopia is the functionality, take place to teenagers more, eyesight can drop during several weeks or 1- 2 months, can get somewhat recovery after the appropriate rest. Myopia it is genuine is to be organic change,can't spontaneous recovery. There are three kinds as follows of differentiation diagnostic methods: (1) Ciliary muscle paralysis law: Lie in anesthetizing medicines to relax, regulate with the ciliary muscle, make the ciliary muscle lax, make the eyes in static behavior to crook all state, and then check eyesight and have an eye test to fix. Use 1% of the atropine eye drop, 1~2 times a day, it takes 3~4 days continuously; Or the horse asks product or 0.5% to ask the product amide to amount to 6 times once every 5~15 minutes after 2%. It drip at the moment, after check by bore hole eyesight under the mirrors separately,if be come loose it turns into that genuine is near-sighted to eyesight behind pupil, eyesight increases to pseudo-myopia; It is real to have near-sighted diopters to have an eye test, there is no near-sighted diopter that is false. This is the generally acknowledged most reliable method of differential diagnosis. (2) Cloud and mist law: Let patient's eyes wear +3.0D spherical mirror at the same time, see far the thing lasts 3 minutes, then remove the right lens, check the intersection of bore hole and eyesight immediately, eyesight person who progress as getting false, the persons who do not progress, as genuine; And then Israel and France check the left eye. This method is not very precise. (3) Examine shadow law dynamically: Needn't distribute the pupil, check first the eyes are far, near the eyesight of bore hole. Long sight the intersection of strength and bad near-sighted strength have other the intersection of influence and visual the intersection of eyes and disease in order to distinguish the target while being normal. Doctor and patient sit face to face in the darkroom. Patient wear try on mirror holder, put the intersection of +2.25D and the intersection of ball and mirror at the moment while being about. Patient eyes watch attentively, examine shadow, look at, mark at the mirror at the same time, the crack is only lighted by examining by the shadow mirror) ; Make 33cm before examining the shadow dynamically with the location. Judged finally: It is to go against the persons who are moved near-sighted for genuine to suffer from eyes every radial. Every radial is arranged and move or not, or it is moved that a radial is suitable, another radial is moved for facing or long sight. Because it displays eyesight as being near-sighted so pseudo-myopia; A radial is moved in order to go against, the persons who are moved or not moved of another radial in order to arrange, for the mixing astigmatism. (First clinical institute of Bethune medical university Yu Jun)

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