That's cause PD is measured by the optician separately when you're ordering your glasses, not by the optometrist or opthalmologist who writes the prescription.
In other words, it's not part of the prescription, it's instead part of the glasses fitting process.
A non-eye related example would be if your doctor prescribed you a brace and the person at the medical supply store measured you to find out which size you need.
In other words, it's not part of the prescription, it's instead part of the glasses fitting process.
A non-eye related example would be if your doctor prescribed you a brace and the person at the medical supply store measured you to find out which size you need.