Place the ruler on your nose so that it is just below or above your pupils when looking straight ahead.ģ. If another person is taking measurements, look at the object approx. Do not bend down and keep your head straight. For measuring the distance between the pupils, for example, a tape measure and a small mirror to which you have to bend are NOT suitable.ġ. Prepare a hard ruler divided into millimeters and a well-lit mirror that you can stand in front of you. If you have such an opportunity, especially if you have a severe visual impairment, ask someone for help – then the examination will take literally a few minutes and the results will be more reliable. Don’t worry, it’s easy! How do I measure my pupil distance myself? Therefore, if you want to buy corrective glasses online and the doctor has not marked your PD on the prescription, be prepared to measure yourself. No good company dealing in the production of corrective lenses will create glasses for you without knowing this parameter, because it could expose you to serious health consequences and deterioration of eyesight. Thanks to a special device – pupillometer – it is able to measure PD with an accuracy of 0.5 mm.
Ideally, this should be done by an ophthalmologist who will write you prescription for prescription glasses. This means that a well-made PD measurement can serve you from adulthood throughout your life, so it’s worth paying attention to. Importantly, pupil distance changes with age but stops in adults. In the first case, it determines the distance between the pupil centers, and in the second case, the distance between the left pupil and the center of the nose, and the right pupil and the center of the nose. It may therefore be given, for example, as “65 mm” or “32.3 mm and 32.7 mm”. The mean PD value in children is considered to be 43 mm to 54 mm, and in adults, 54 mm to 74 mm. Pupil distance can be represented in two ways – less accurate as one number or more precise as two numbers.
It is given in millimeters, and the greater the error in its measurement, the more serious the consequences may be for a person with a visual impairment who wears glasses made on the basis of it. Pupil distance (PD) is, simply put, the distance between the pupils of the eyes.
#PUPIL DISTANCE HOW TO#
See why this parameter is so important, how it is recorded and how to measure it yourself if an ophthalmologist has not done it for you. Are you planning to buy new prescription glasses online? In order to spend your money wisely and not to suffer from ailments related to wearing mismatched lenses, you first need to know your pupil distance (PD).
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