Now glasses have begun to perform not only a protective or corrective function, but also serve as a fashion accessory that can change a person's appearance and complement a stylish look. There are several functional types of lenses, and even more forms of frames. But before you buy the model you like, you need to learn how to determine the size of the glasses so that wearing them is convenient and comfortable.
The correct fit of the named accessory is very important, because it will be very sad when an expensive purchase after a few minutes of wearing will squeeze some parts of the face or, conversely, fall off during bending.
If the frame has dimensions that do not correspond to your anthropometric parameters, then you should not even buy the model you like very much.
Main geometric dimensions of glasses
In order not to make a mistake in choosing the right frame, you need to know how to determine the size of glasses. To help you choose a frame, there are a few common parameters that allow you to effortlesslychoose a suitable model. There are only four of them:
- Lens width.
- Lens height.
- Width of bridge between lens frames.
- Temple length.
When choosing glasses with progressive lenses, one of the parameters of the frame is of particular importance - this is the height of the light openings. When choosing vertically narrow frames, the height of the lens should match the progressive lens design of the glasses.
It is best to contact an ophthalmologist or consultant optician who will help you check the correctness of the choice. To this end, they check the compliance with the minimum installation height, which is indicated for the selected model of spectacle lenses, as well as the dimensions of the selected frame for these glasses.
The size of the glasses on their frames
The main parameters that help when choosing glasses are indicated in millimeters, they can be seen on the inside of the behind-the-ear arch. These numbers will help you answer the question - how to determine the size of glasses. Ray Ban, Oakley, Persol and other manufacturers of branded models of these accessories indicate the main parameters on their products. For example, you see the numbers 60 - 14 145 on the inside of the temple, they correspond to the following indicators: the width of the opening, followed by a dash or a square icon indicate the width of the bridge, and then, through a space, a number that indicates the length of the temple.
Spectacle lens width is rarely reported.
And on someglasses of an inexpensive price category, you can find only one number - it corresponds to the length of the temple.
Sunglasses frames are usually larger than corrective glasses frames.
Determining the width of the face
Accurate knowledge of the width of the face will help solve the question - how to determine the size of glasses. At home, measuring the width of the face is a bit difficult, but possible.
To do this, you will need two pencils or pens, which will need to be placed behind the ears, and measure the distance between them with a ruler.
Let's demonstrate another way to determine the size of glasses, focusing on the size of the lens. You need to subtract the size of the bridge above the bridge of your nose from the width of your face, then subtract another ten centimeters. The resulting number must be divided by two. The result is an optimal lens size that fits your face.
How to determine the size of a child's glasses?
Children are more difficult to sit down to measure their facial measurements. In addition, these indicators are constantly changing, especially with regard to the size of the bridge of the nose. The bridge in children's glasses is of great importance, because it is precisely because of the constant change in its width that it is necessary to change the glasses after a certain period of time.
Until the age of six, the size of the bridge of the child's nose changes little, and at seven to nine years, the nose develops to its final size.
To measure the main parameters that will be needed to buy glasses, it is better to use the help of specialists or do it yourself while the child is sleeping.
Rules for sizing glasses
In order to know how to correctly determine the size of glasses, you need to follow a few recommendations when performing basic measurements:
- Total width of a frame is defined as the sum of the bridge and the width of the two lenses, plus the width of the hinges that secure the temples to the frame. The resulting number is usually between four and ten millimeters.
- The full width of the spectacle frame should correspond to the width of the face on which the glasses are fitted and should not differ from the last figure by more than two to three millimeters.
Glasses buying tips
It is best to purchase the accessories described in specialized stores or opticians. In addition, experts recommend choosing well-known or at least familiar brands and brands of glasses. And for this, you should seek the help of an optician-consultant, who is always present in every decent store selling glasses.
When buying glasses on your own, be guided by the sizes of the previous ones, previously purchased.
