People who have come to the optometry center to check their eyesight know that before entering the clinic, they usually need to have a computer optometry at the nurse station, and at present, many glasses stores use computer optometry to check the degree for consumers, so is it accurate to have a computer optometry for children?
Don’t believe in computer optometry
Computer optometry developed in the 1970s and belongs to objective optometry. The machine used for this optometry is a combination of optics, electronics and machinery. Its principle is basically the same as that of retinoscopy. In addition, it uses infrared light source and automatic fogging device to relax the adjustment of the eyeball. It uses photoelectric technology and automatic control technology to check the diopter of the eye, and can display and print the diopter automatically. This method is easy to operate and fast, which is a great progress of optometry technology. However, there are some errors in the measurement results of eyes, and only the approximate range of refraction can be predicted. One of the major defects of computer optometry is that it only completes the whole process of operation in a moment, just like a flash of camera shutter is easy to cause the tension of the examinee, and the visual acuity also rises in an instant, resulting in inaccurate test results. Secondly, the errors caused by the computer optometry results can not exclude the improper operation and subjective bias of the optometrist, as well as the stability of the quality of the machine itself or the inaccuracy of the optometry results caused by the aging of the machine.
The main errors caused by computer optometry results are the high degree of myopia, the low degree of hyperopia and the difference of astigmatism axis. Therefore, computer optometry results can only be used for clinical reference, not directly as a prescription for matching glasses. So no matter what kind of advanced computer optometry, it does not have the accuracy of artificial optometry. Of course, because the computer refractometer can quickly measure the general situation of diopter, it can provide useful reference for understanding the diopter degree of patients and a large number of outpatient optometry in the diagnosis and treatment of ophthalmopathy. At present, the more safe and standard method of matching glasses is to conduct artificial patch optometry after computer optometry, and to synthesize the results of the two optometry methods. The correct optometry should be divided into three steps: computer preliminary test, darkroom examination and trial wearing correction. Especially in the second step, an experienced optometrist can observe the reflection of light projected to the retina through the hole of the optoscope, and judge whether the subject is nearsighted, farsighted or astigmatic according to the change of speed, brightness and direction, so as to avoid the possible error of computer optometry.
Young people are not suitable for computer optometry. Because of the strong regulation of ciliary muscle and the increase of change factors, some teenagers don’t relax their eyes completely during the computer optometry, so the myopia degree measured is often on the high side, and the astigmatism deviation measured is less. In addition, most of the myopia in teenagers is regulatory myopia or pseudomyopia. If it is necessary to use computer optometry, atropine eye water should also be used before optometry, which should be carried out after sufficient paralysis of ciliary muscle, especially for children under 12 years old when choosing optometry.
Therefore, children’s computer optometry with glasses, absolutely not. It can be clearly said that computer optometry can not be the only basis for matching, and the so-called “three minutes computer optometry” is more harmful! If you are interested in children’s home electric shock prevention knowledge, please go to this safety net to find relevant information.