What information do I need when online buy prescription eyeglasses?

Online buy glasses need those optometry parameters

Regular online stores all require the following data: No astigmatism: left and right eye degree, interpupillary distance.
With astigmatism: left and right eye degree, astigmatism, axial position, interpupillary distance
Adults and children offline optometry, online glasses real dry goods experience sharing

Optometry is very important!
Unqualified optometry may easily lead to bad vision damage after glasses, and some damage may even be irreversible;

Do I need to have a test every time I wear glasses?
Yes; it used to be said that eyesight is stable after adulthood, but now the penetration rate of computers and mobile phones is high, and the time spent using the eyes is much longer than before, so it is still necessary to go to a regular optical shop (equipment qualified) every year when glasses are fitted. Eye hospital (equipment is qualified), the cost of each optometry is not a lot.
The most important thing for each optometry is whether there is a change in the pupillary distance between the left and right eyes and whether there is astigmatism;

The steps of adult optometry
Medical optometry such as internal and external eye examinations are also required, but these are items of annual physical examination, so there is no need to do them alone;

1. Computer optometry, this depends entirely on the equipment, the better the equipment, the more accurate the data, so it is recommended to go to the flagship store of a large chain optical store;
2. For the interpupillary distance test, the traditional ruler measurement may rely too much on the optometrist's technology, and there is a certain probability of deviation in the monocular interpupillary distance test, so it is more ideal to use an instrument to measure;
3. Insertion test, optometrist adjusts the degree according to the recommended degree given by computer optometry, combined with the wearing experience feedback from the spectacle wearer;
4. Eyesight tests are all computer screens now, the common one is E, and there are some auxiliary tests for opening graphics;
5. Astigmatism test, the computer screen displays an astigmatism disc to confirm astigmatism, usually whether there is astigmatism, the computer will give data when optometry;
6. Red and green test, this is used to test the increase or decrease of the degree of the insert, generally floating up and down by 25 degrees.
7. Wear the insert for the walking test, wear the insert to walk outdoors, the best test is to go up and down the stairs to see if there is any discomfort;
   With this prescribing information, it's easy to go to an online store to get your glasses fitted. Information about children's eyes will be mentioned in the next section.