What is PD? PD, aka Pupillary Distance, is basically the measured distance between the centers of your two pupils. This measurement is used to determine where you look through the lens and identify the focus point of your glasses. Thus it is essential for it to be as accurate as possible. The average adult’s PD is between 54-74 mm, and kids’ are somewhere between 43-58 mm. Now that you have the answer to your question- what is PD? You must also know how and when it is measured. Your eye doctor measures your PD during an eye test, but if you want to measure it yourself before purchasing glasses for yourself, we have got some DIY hacks for you!
However, in case you haven’t quite understood what is PD exactly, you will definitely get a better idea after learning how to measure it yourself. But before we move ahead, here are the two types of pupillary distance measurements that you must be aware of: • Monocular PD: The distance between the center of your pupil and the center of the bridge of your nose is called the Monocular PD measurements. This type of PD measurement is required for the accurate fitting of progressive lenses. • Binocular PD: The distance between your one eye’s center of the pupil and the center of the pupil of the other eye is known as binocular PD measurement. Thus after knowing the two types of pupillary distances, you can now answer the question- what is PD yourself.

After understanding what is PD now, you must be looking forward to measuring your Pupillary Distance. Usually, the doctors measure it for you when you go for the fitting of your new glasses with a high-precision measuring device called a pupillometer. Knowing what is PD and measuring it yourself can be of major help when you have your eyeglasses prescription and are shopping for a brand-new stylish pair of glasses online. 
So, here’s how you measure it yourself at home:
Step 1: Find a millimeter ruler and a mirror. 
Step 2: Stand about 12 inches away from the mirror. 
Step 3: Hold your millimeter ruler horizontally, above your eyes, and flat against your eyebrows. 
Step 4: Keep your right eye closed 
Step 5: Use your left eye to align the ruler’s zero mark with the middle of the pupil of your left eye. 
Step 6: Carefully close your left eye and open up your right eye without changing the position of the ruler. 
Step 7: Identify the millimeter mark on the ruler aligned with the middle of the pupil of your right eye. Write down or memorize this measurement because this is your distance binocular PD. 
You can repeat these steps a few times to ensure that you are getting the same PD measurements at all times.
Moreover, in case you already wear prescription eyeglasses, then here’s an alternate way to measure your pupillary distance. All you need is just a non-permanent marker for this one! 
Step 1: Stand 12 inches away from the mirror while wearing your glasses. 
Step 2: Close your right eye. 
Step 3: Now, use your left eye and put a small mark on the left lens of your glasses, just in front of your pupil. 
Repeat this step for the other eye, and voila! It’s done!
Now that you know what is PD and how to measure it yourself, you can move on to the more fun part- Shopping! 
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How To Measure Pupillary Distance Yourself At Home?

What is Pupillary Distance and How to Measure it?

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Learn to measure your pupillary distance (PD) at home using a mirror and ruler. Follow this step-by-step guide for accurate PD and a precise eyeglass fit.