Q: Hello, I do not have a prescription, but my opthomoligist said O need to buy 225 reading glasses. I don't know what my PD is.
Need help to figure out.
Thanks.
A: Dear Grace Thomas Clarke, You can choose +2.25 as your sph values. The PD is very important to your vision. We need to make the lenses according to your PD.
If you don\'t know your PD, you have rights to contact your doctor/optometrist to get your accurate PD value.
Or you can measure it yourself with a millimeter ruler.Follow these simple steps:
1.) Rest a mm ruler on the bridge of your nose just in front of your eyes. Look straight ahead and line up the 0mm marker with the center or one pupil.
2.) Read the ruler in a mirror, or have someone at the same height as you read it.
3.) The mark that lands in the center of the other eye is your Pupillary Distance.
4.) Repeat these steps 2-3 times to make sure your results are accurate.