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| -O.D.
| -2.0
| -0.5
| +1.5
| -O.S.
| -2.25
| -0.75
* OD is oculus dextrus, or Latin for right eye.* OS is oculus sinister, or Latin for left eye.* BO is Base out, BI is Base in, BU is Base up and BD is Base down.for [[prism]]
[[Pupillary Distance]] or PD, is the final set of numbers you need to be aware of. Most likely this is not listed on your "prescription" you will need to ask for it or [ measure it yourself]. Some optometrists will charge you e.g. $30 to tell you your PD, but many others will tell you for free.


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