Pupillary distance helps center your eyeglasses prescription. Your eyeglasses provider normally measures it for you, but you won’t find it on your prescription. If you order glasses online, you’ll ...
The pupillary distance (PD) measurement is a requirement for people who want to purchase eyeglasses. Here, find out how to measure your PD using a mirror and a ruler. Share on Pinterest Some eyewear ...
There are different types of rotational tests. In these tests there are two different types of test settings which can be used: In a controlled shear rate test (CSR or CR test) the speed or shear rate ...
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