It’s possible to do it yourself, but you have to follow some simple but important guidelines: Often the specialty of optometrists and eyeglass fitters, measuring PD can be tricky. There is no reason for your doctor to check on your pupil width every year, and since it’s not part of your routine care, your doctor may not keep a record of your measurement. Your eyes do not move farther apart as you age, and no diseases are marked by widening pupils. Your pupillary distance is not considered clinically significant, says the Alberta Association of Optometrists. But your doctor may also take measurements to check on the health of your eye. If you are planning for surgery, this test is important. If your pupils are large and wide, you could encounter difficulties with glare and halos after refractive surgery. Your doctor may measure how big your pupils are and compare those readings to anatomical charts. Your doctor will look at your eyes while you are sitting in low light. Your doctor will ensure that your eyes constrict and that both eyes work in the same way. Your doctor will measure how big your pupils are both in natural light and when a light is shined into your eyes. The American Academy of Ophthalmology explains that your doctor will: Many pupil measurements are critical to eye health. But not all eye doctors will measure your pupillary distance during an exam. Measuring Your Pupillary Distanceĭuring an optometric exam, you will undergo many measurements. But if you can’t see without discomfort, it’s hard to handle everyday tasks. Your eyes are not harmed by lenses that do not fit your eyes. But as you continue to wear ill-fitting glasses, the issue may become painfully obvious. You may not notice the problem right away. If something is not quite right, the light will not move as it should. Glasses are precise tools, and prescription versions rely on delicate measurements. The lenses in these products can correct both nearsightedness and farsightedness. The lenses in these items help to correct nearsightedness or farsightedness. These lenses help people with aging eyes to see items clearly, even when they are held close to the face. There are multiple types of glasses, including: Your PD helps the lens-crafting company to cut the lenses just right, so they sit within the frames properly.Īs the National Eye Institute explains, glasses work by bending the light that enters your eye. It’s a small number, but it’s a critical one for people who wear glasses.Īs you probably know, your glasses contain two lenses held together by a stiff frame that sits on your nose. Your pupillary distance (PD) is a measurement between the center of one pupil and the center of the other. But you may not know how far apart your pupils are from one another. If you are asked, you can probably cite your height, weight, shoe size, and waist measurement. But it’s difficult to get the measurement just right. If you do not want to sit for a second fitting exam, you can attempt to grab the data on your own at home. The measurement isn’t considered to be clinically significant. Some people believe doctors will not give you the measurement to save money. You might have to pay more for this small test, and you might have to go to an optician (not an ophthalmologist) to get the results. They do not, however, always measure your pupillary distance. During an optical exam, doctors take many pupil measurements.
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