Mydriasis is a common examination and treatment method in ophthalmology.
The pupil, the so-called Kurome, is determined by the relaxation and contraction of the iris and ciliary muscles. In dim light, people are excited by sympathetic nerves, and their pupils will enlarge when muscles relax. Under strong light, the parasympathetic nerve that dominates it is excited, which can release acetylcholine, cause the sphincter of pupil to contract, and the pupil will shrink. Pupil dilator and pupil sphincter coordinate and restrict each other, which can regulate and protect vision.
Mydriasis examination is to use drugs to excite sympathetic nerve or inhibit the impulse of parasympathetic nerve, so as to enlarge the pupil. Commonly used drugs are atropine, homatropine, neofolin and so on. These drugs will paralyze the ciliary muscle, inhibit the adjustment ability of the eyeball, and make people temporarily afraid of light and have blurred vision.
This phenomenon will disappear after the drug action time, so it will not cause any harm to the eyes. For example, mydriasis during optometry can not only make the optometry degree accurate, but also distinguish true myopia from false myopia.
In addition, mydriasis itself is also a therapeutic measure. If you suffer from iridocyclitis, dilating the pupil can relieve the muscle spasm in the eye, improve the local blood circulation, relieve the pain and catch up with the inflammation. It can also prevent serious complications such as posterior synechia of iris, pupillary atresia, membranous closure and secondary glaucoma.
After mydriasis examination, there may be temporary fear of light and blurred vision. You can wear a mirror to protect your eyes, and then take it off after the pupils return to normal.