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 image. There are several functional types of lenses, and even more forms of frames. But before you purchase the model you like, you need to learn how to determine the size of the glasses so that they are comfortable and comfortable to wear.
The proper 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 it during tilting.
If the frame has dimensions that do not correspond to your anthropometric parameters, then you should not even buy a model that you really like.
Basic geometric dimensions of glasses
In order not to make a mistake in choosing a suitable frame, you need to know how to determine the size of the glasses. To help with the selection of the frame, there are several generally accepted parameters that allow you to choose a convenient model without much effort. There are only four of them:
- The width of the lens.
- The height of the lens.
- The width of the bridge between the frames of the lenses.
- Length of earhooks.
When selecting glasses with progressive lenses, one of the frame parameters is especially important - this is the height of the light openings. When choosing a narrow vertical frame, the height of the lens should be consistent with the progressive design of the lenses of the glasses.
It is best to consult an ophthalmologist or optician-consultant who will help verify 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.
Sizes of glasses on their frame
The main parameters that help in 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 the points. 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 inner side of the earhook, they correspond to the following indicators: the width of the aperture, the width of the bridge is indicated by a dash or a square icon, and then, by a space, a number that indicates the length of the earhook.
The index of the width of the spectacle lens is indicated very rarely.
And on some glasses of an inexpensive price category, you can find only one number - it corresponds to the length of the ear.
As a rule, frames for sunglasses are larger than frames for glasses with corrective function.
Determine the width of the face
Accurate knowledge of the width of the face will help solve the question - how to determine the size of the glasses. At home, measuring the width of the face is a little difficult, but possible.
To do this, you need two pencils or pens, which will need to be laid 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 from the width of your face the size of the arch above the bridge of the nose, then subtract another ten centimeters. The resulting number must be divided by two. The result is an optimal lens size that is right for your face.
How to determine the size of the child’s glasses?
It’s harder for children to sit down to measure their facial parameters. 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 because of the constant change in its width that you have to change points after a certain period of time.
Until the age of six, the size of the nose of the child varies slightly, and at seven to nine years old the nose develops to its final size.
To measure the main parameters that you will need to buy glasses, it is better to use the help of specialists or do it yourself while your child is sleeping.
Rules for selecting points by size
In order to know how to correctly determine the size of the points, you need to follow a few recommendations when performing basic measurements:
- The full width of the frame is defined as the sum of the bridge and the width of the two lenses, and the width of the hinge joints is added to them, with which the temples are attached to the frame of the frame. The number obtained as a result, as a rule, is in the range from four to ten millimeters.
- The full width of the frame of the glasses should correspond to the width of the face by which the glasses are selected and should not differ from the last indicator by more than two to three millimeters.
Points Buying Tips
It is best to purchase the described accessories in specialized stores or opticians. In addition, experts recommend choosing well-known or at least familiar brands and brands of glasses. And for this it is worth asking for help from an optician-consultant, who is always present in every decent store that sells points.
When buying glasses yourself, focus on the sizes of previous, previously purchased.