Children's myopia is a sensitive problem that troubles many parents. Once it is confirmed as true myopia, it will not only bring inconvenience to study and life, but also cause visual fatigue, conjunctival congestion and other symptoms. High myopia is also prone to vitreous opacity, retinal detachment, macular degeneration, macular hole and other complications.
Therefore, parents should pay attention to their children's eye development and vision health, so as to detect myopia early and intervene early. Vision care is lifelong, and optometry and glasses are more related to the health of the eyes, so you should not be careless. The medical optometry process is rigorous and the measurement degree is accurate, which not only allows the optician to see the object clearly, but also makes it comfortable and durable to wear.
There are still many parents who have doubts about the optometry process. Here are some simple answers to some special examinations in the optometry process.
Function of mydriasis
The purpose of mydriasis is to remove the adjustment of the ciliary muscle and expose the true diopter of the eye. It is an essential step before the children's optometry, and also a good way to let the ciliary muscle rest. Just like we sleep, the eye regulation function relaxes. Pupils dilate and eyes are at rest.
Some parents have misconceptions about mydriasis optometry. They worry that mydriasis will cause damage to their children's eyes, and they have many misgivings about mydriasis optometry. In fact, mydriasis does not have any impact on the eyes. It uses drugs to completely paralyze the ciliary muscles of the eyes. When it loses its regulatory effect, it can perform objective refractive examination to accurately and objectively detect the refractive state of the eyes.
Function of measuring eye shaft length
The type of human refractive error can be evaluated by measuring the axial length of the eye and combining the corneal radian. The normal axial length of the eye is about 23.5~24mm. The diopter changes about 3.00D (300 degrees) when the axial length changes by 1mm.
Through the comparative analysis of the results of axial examination, we can understand the growth range and speed of myopia degree, and provide a basis for clinical selection of correction methods for refractive errors.
Purpose of corneal topography
The examination of corneal topography mainly focuses on the shape of cornea.
In different operations or diseases, the purpose will be slightly different. It is used to eliminate the problem of keratoconus before the laser treatment of myopia; Before cataract surgery, it is used to detect which axis of astigmatism is larger, guide the selection of incision, and follow up the change of astigmatism in the large astigmatic population; It can also assist in the matching of corneal contact lenses.
Purpose of visual function examination
When children wear glasses, they are required not only to have good corrected vision, but also to be able to use both eyes in harmony. Therefore, it is very important to check the visual function during optometry. Visual function inspection can be used to determine whether the far and near eye positions, stereoscopic vision, adjustment and convergence functions are normal.
According to the results of visual function examination, optometrists can accurately understand the function of children's eyes, so as to provide children with personalized matching programs and guide children to use their eyes scientifically.
Pupillary distance
Pupil distance refers to the distance between the pupils of two eyes, and the measurement of pupillary distance is mainly used for matching frame glasses.
Once the pupil distance is not measured accurately, the optical center of the glasses and the pupil center will not completely coincide, and uncomfortable symptoms such as wearing glasses and dizziness will occur. Therefore, it is important to measure the accurate pupil distance.
Inspection required for fitting corneal shaping lens
Before fitting the corneal shaping lens, it is necessary to conduct a comprehensive examination of the eye health and various eye parameters to ensure the success of the fitting. These examinations include anterior segment slit lamp examination, intraocular pressure examination, tear film examination, corneal curvature measurement, corneal topography examination, eye axis examination, corneal endothelium examination and corneal thickness measurement, as well as accurate optometry and visual function examination. Therefore, it is recommended that you go to a professional ophthalmic institution to check the corneal shaping lens.