The first step in fitting discountglasses is optometry. This is the most important step, verifying the degree is crucial. Without an accurate prescription for optometry, even the best lenses are useless.
How to accurately determine one's cheapest eyeglasses degree? Optometry is generally divided into two parts: objective optometry and subjective optometry.
Objective optometry is to place the chin on a machine, and the machine will print a computerized optometry sheet with the required pupillary distance for glasses fitting. The other data is used as a reference for subjective optometry.
What is pupillary distance? It is the distance between the center points of the two pupils of the left and right eyes, and this value must be accurate. If the pupil distance is not correct, wearing glasses will cause dizziness.
Subjective optometry will test a recommended correction degree for you through insertion, and finally you will receive a prescription sheet. There are the following data: degree of myopia/hyperopia, pupillary distance. If your eyes have astigmatism, in addition to astigmatism, there will also be an astigmatism axis, and these data are indispensable.
After measuring the degree, you need to walk around wearing the corresponding degree, look around, adapt, and audition. If you feel dizzy, we can adjust the degree for you.
For children under 12 years old who are wearing children's eyeglasses for the first time, it is recommended to undergo mydriatic refraction under guidance. Based on the results of mydriatic and complex refraction, a comprehensive judgment should be made to determine the final prescription for refraction.
Here is the key point. I will use a machine to test and create a computerized optometry sheet. This sheet cannot be used as the measured degree is generally higher. It can only be used as a reference value for manual optometry and cannot be directly used for lens matching. Remember that computerized sheets cannot be used for direct lens matching.
