# Should I measure single or dual PD?

## Should I measure single or dual PD?

Single PD is the total distance between the center of both pupils. We recommend measuring dual PD. This is why: Dual PD is believed to be the most accurate since many people have different distances between their nose and pupil on each eye.

## How do you convert dual PD to single PD?

For example, if your distance PD is 63mm, then your near PD is 60mm. If you are using Dual PD to calculate near PD, then subtract 1.5mm from each eye’s measurement.

What happens if you have 2 PD numbers?

If your PD has two numbers, do not worry, as it is very simple to figure out. If the two numbers are the same, add them together to get your PD number. If the two numbers are different, the higher number of for distance and the lower number is for near vision.

### What’s the difference between single PD and dual PD?

A single PD number (also called binocular PD) is the total distance between the middle of both your pupils added together. A dual or two PD numbers (called monocular PD) is the measurement of the center of each pupil to the bridge of your nose individually.

### What’s the normal PD for glasses?

PD is measured in millimeters (mm). The average pupillary distance for an adult is about 63 mm, but this is not a number you’ll want to assume. Pupillary distance can vary widely — roughly between 51 mm and 74.5 mm for women and 53 mm and 77 mm for men.

What does PD 60 57 mean?

If you have two different numbers for PD, you have either been given both the. distance/reading or right eye/left eye: ex) • 62 ( total PD = right +left ) • 60/57 : distance/reading PD. • 30.5/29.5 : right /left PD (this can be 60 in total)

## What is the average PD for a woman?

PD is measured in millimeters (mm). The average pupillary distance for an adult is about 63 mm, but this is not a number you’ll want to assume. Pupillary distance can vary widely — roughly between 51 mm and 74.5 mm for women and 53 mm and 77 mm for men.

## Why do some people have 2 PD numbers?

Two low numbers (e.g. 30/31): The first number is the monocular PD for the right eye (O.D.) and the second number is for the left eye (O.S.). Two high numbers (e.g. 62/59): This is used only for reading glasses. The first number is your Distance PD and the second number is your Near PD.

Can I find my PD on my glasses?

You usually can’t find your PD number written on your eyeglasses. The numbers on the inside of the temple arms of some frames show the measurements for the frame itself. Your PD number should be written on your eyeglass prescription in the PD section.

### Can you measure PD from old glasses?

Grab your old glasses and a non-permanent marker pen. Get your partner to mark a small dot where your pupil is behind the lens. Measure the distance between the dots for your total PD.

### What does PD 65 62 mean?

Some prescriptions have two numbers, written such as PD 65/62 usually written on a bi-focal prescription. This means that 65 is your distance vision PD, and the one to be entered on our forms. And 62 is the reading or near vision PD, the one to be used only if you are ordering a plain reading glass only.

How to measure your pupillary distance?

Grab a ruler with millimeter units.

• Stand in front of a mirror.