2 Measurements to Make Before Getting Prescription Glasses

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If you are having difficulty seeing, then now may be the time to see an eye doctor about prescription glasses. The glasses will be made to correct your specific visual deficit and the eye doctor will use a variety of different measurements to make sure that your glasses fit you correctly. Keep reading to learn about a few of them.

1. Pupillary Distance

When glasses are created for you, the technician will need to know the center point of each lens. This way, the lenses can be fit into the glasses correctly to allow you to see clearly in all directions. The center point is different depending on your anatomy and it is determined by pupillary distance. Pupillary distance is the measurement in millimeters from the center of each pupil as you look straight in front of you. 

Your eye doctor will calculate the measurement during your eye exam using a ruler on top of the phoropter machine. The measurement is important because if it is not correct, you may still experience blurred vision with your glasses on. Double vision, headaches, tired eyes, and general fatigue are some things you may experience as well. Typically, you are more likely to experience eye symptoms with an incorrect pupillary distance if you have fairly significant astigmatism or myopia. For this reason, your eye professional will ensure that the measurement is as accurate as possible, especially with prescriptions that are considered a bit more complex.

2. Facial Structure

Your eye doctor will likely look at your facial structure to make recommendations on the size and shape of the glasses that will best suit you. While direct measurements are not taken, fit is considered as you try on frames because every pair of glasses has its own unique dimensions. These include the frame width, lens width, lens height, bridge width, and temple height. 

Your choice of frames may be limited if you have a slim face with eyes close together. This is also true for a wide face and far-set eyes. And, if the prescription is complex then the lens may limit your choices. In this case, the lens may be too thick to fit in a smaller frame. 

The good news is that there are a wide variety of different prescription frame options available to you. If you have glasses currently that you like, then think about bringing these with you to your eye appointment. The different dimensions can be measured to find similar frames for you. 

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