Abstract: mydriatic optometry, that is, ciliary muscle paralysis optometry, is to completely relax the eyes with drugs and detect the refractive state without regulation. During the action of drugs, there are photophobia and near vision difficulties. After the action of drugs, the eyes return to the initial state of examination.
question 1. Why mydriasis?
first of all, we should clarify the purpose of mydriasis. Because children’s eyes have strong adjustment ability, it is easy to form adjustment spasm after excessive use of eyes, resulting in false image of myopia, namely false myopia. So, Through mydriasis, we can diagnose the type of myopia (i.e. true near pseudomyopia) and obtain accurate diopter.
question 2. Is mydriasis a side effect?
Mydriatic optometry, i.e. cycloplegia optometry, uses drugs to completely relax the eyes and detect the refractive state without regulation. During the action of drugs, there are photophobia and near vision difficulties. After the action of drugs, the eyes return to the initial state of examination. It is a local drug with less dosage and no follow-up side effects on the whole body and local areas. However, before this examination, intraocular pressure should be measured to eliminate the possibility of glaucoma. Mydriasis may induce acute angle closure glaucoma for patients with high intraocular pressure, but it rarely occurs in children. Therefore, mydriatic optometry is relatively safe for children. Only in a small part of the population (mostly the elderly) due to abnormal eye anatomical characteristics, mydriasis leads to high intraocular pressure and induces the onset of angle closure glaucoma, but it is very rare in children.
question 3. Just disperse quickly? Slow dispersion is not good?
quick powder are cycloplegic optometry under the action of topicamide. They are mainly suitable for older children and adults. The method is to click every 5 minutes, take a break after 5 times, and then go for optometry after 30 minutes.
slow powder is the optometry of ciliary paralysis under the action of 1% atropine. It is suitable for young children, especially those with hyperopia, esotropia and amblyopia. The method is to point 3 times a day, with an interval of more than 6 hours each time, for a total of 3 days. Come to the hospital for the first optometry on the fourth day, calculated from the first optometry examination day, and come back to the hospital for re optometry on the 21st day. Slow mydriasis can fully paralyze the muscles that control the contraction of the pupil, and the results of optometry will be more accurate. It takes two to three weeks to return to normal after mydriasis.
are not good or bad. It depends on the child’s age and actual eye conditions!
question 4. Is it true myopia or false myopia?
pseudomyopia is functional. It is caused by the regulatory spasm formed after muscle spasm. It mostly occurs in adolescents. Vision can decline in a few weeks or 1 ~ 2 months, and can recover to some extent after appropriate rest.
true myopia is an organic change, and the eyeball structure changes substantially, which can not recover naturally. If the child’s poor eyesight lasts for half a semester or several months, it is likely to be true myopia.
many parents have hope that their children are only pseudomyopia. In fact, to judge whether a child is pseudomyopia or true myopia, it needs to be determined in combination with mydriatic optometry results, eyeball structural parameters and eye functional state. After mydriatic optometry,
have no myopia, and the diopter is pseudomyopia; Myopia diopter is true myopia.
question 5. Does myopia need glasses?
once suffering from true myopia, you need to wear appropriate glasses to help your eyes work normally. At present, the optical lenses suitable for myopia include frame glasses and contact lenses.
for children, wearing frame glasses is a classic method to correct myopia, but it will still increase year by year. Contact lenses should be hard high oxygen permeable lenses. It can be divided into day wearing type and night wearing type. Day wearing type is suitable for those with high myopia, high astigmatism or high hyperopia and anisometropia; The night wearing type is called corneal shaping lens, commonly known as OK lens. It is mostly used in children and adolescents in the growth and development period. It plays a special “shaping” role in wearing glasses at night on the cornea, and can appropriately delay the progress of juvenile myopia.
need to remind parents that the fitting of any type of glasses requires professional technology. It is recommended to carry out it under the guidance of ophthalmologists and optometrists.
question 6. Can eye care reduce the degree of myopia?
with the growth and development of children, the diopter of myopia will only increase but not decrease. 90% of teenagers are axial myopia. With the length of the eye axis, the degree of myopia gradually increases. Generally, for every 1 mm increase in the length of the eye axis, the degree of myopia will increase by 275 degrees. For simple myopia, the length of ocular axis will not increase after the age of 18, and the degree of myopia can be stable within a certain range. Any method can not make the lengthened eye axis shorter, so eye protection will not reduce the degree of myopia.