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Teach you to understand the eye examination sheet (3) eye axis and corneal curvature radius

Posting time:2022-10-06 01:24:29

Teach you to understand the eye examination sheet (3) eye axis and corneal curvature radius

Every time you come to the outpatient clinic, you must have questions. Why do you just open various examination orders when you come to the ophthalmology department? According to the classification of refractive components of myopia, myopia can be divided into axial myopia, curvature myopia, and refractive index myopia. Different types of myopia give different optimal vision solutions, so it is recommended for children to wear glasses. Distinguishing types of myopia. To distinguish the types of myopia, the eye axis and corneal curvature of the child need to be detected. Let's first look at the Axial and Corneal Radius of Curvature Checklist. Axial and Corneal Radius Styles Axial reflects the size of the eyeball. The longer the eye axis, the more myopia. The normal eye axis is 23.5~24mm, and every 1mm longer than normal brings 300 degrees of myopia, on the contrary, every 1mm shorter than normal brings 300 degrees of hyperopia. The eye axis gradually becomes longer from the short eye axis, and the refractive state also develops from farsightedness to emmetropia. Hyperopia has a short eye axis, while myopia has a long eye axis; therefore, it is a very good myopia for children to maintain an appropriate amount of farsightedness. The protective mechanism, the hyperopia state is a necessary reserve for the prevention of myopia. If children use their eyes too much for a long time, it will lead to the development of the ocular axis ahead of time and "deplete" the hyperopia reserve in advance. Even if the naked eye vision is normal, with the continuous development of the eyeball and the growth of the ocular axis, myopia will be inevitable. The normal eye axis is 23.5~24mm, and the corneal curvature radius is 7.8mm. By judging the eye axis/average corneal curvature radius ratio (axial ratio) to evaluate whether myopia is a self-assessment of the risk value, the axial ratio=3 It represents the edge of myopia, and the axial ratio>3 means myopia has occurred; the axial ratio<3 means that myopia has not yet occurred. Seeing this, some mothers will ask: My child's eye axis is normal and the axial ratio is less than 3, but the result of optometry is that he has 100/200 degrees of myopia? what happened? If this is the case, parents, don't worry. Your child's current test result represents pure refractive myopia. Doctors usually prescribe low-concentration atropine to give sufficient pupil dilation to restore the degree. Generally, the smaller the children are more likely to have this condition. (The pictures in this article are from the Internet, if there is any infringement, please contact to delete)

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