A standard mistake when buying vision glasses is not paying enough attention to the size of the accessory. People often focus on the frame, its shape, color, and rarely measure the length of the bridges and arms. If you wear products that are the wrong size, this can lead to eye strain, blurred vision, and headaches. You need to figure out how to find out the size of the device.
Marking of glasses
To determine the parameters of glasses or frames, indicate the data on the inside of the temples. They allow you to set the dimensions of the accessory. In most cases, three numbers are indicated, which are separated by dots, dashes or squares.
Let's look at an example of glasses with data 67-12-145:
- The first number indicates the lens size – its width. The measurement is taken along a horizontal line at the widest part.
- Second indicator indicates the size of the bridge, which connects the glass. If the part is missing, then set the distance between the 2 lenses. In this example it is 12 mm.
- The third number means length of arms or length of temples. The indicator is measured in millimeters from the loops to the end of the temple. The size is 145 mm.
Important! A number of accessory manufacturers write the full frame size. This is done for the buyer so that he can determine the performance of the glasses in detail. A fourth digit is added, which indicates the overall width of the frame.
Calculate the size yourself
To choose the right accessory, you can look at the parameters of the appropriate model or make the calculation yourself at home.
Instructions:
- To determine the width of your face, you need to stand in front of the mirror. Then attach 2 pencils to each ear. They will be the starting points for the calculation. Now measure the distance using a ruler. When choosing glasses at a pharmacy, you should pay attention that their size does not differ from the width of the face by more than 2-3 mm.
- The width of the frame is measured from the outside of the frame. Usually it is 120-150 mm. The indicator is determined from one temple to another at the level of the bridge of the nose.
Important! The arch also has a width, so the measurement is made taking into account a small margin. If the calculation is carried out according to the model of old glasses, then the length from the hinge to the end of the arms is measured.
Calculation
The next measurement can be done mathematically. The lens size parameter (first number) is multiplied by two. Then the size of the bridge on the bridge of the nose is added and up to 10 mm of hinge joints are added. The result is an indicator that indicates the width of the face. But often this method is used to ensure that the size is determined correctly.
What to consider when purchasing?
When choosing accessories, you need to consider some characteristics: material, ease of wear, size, price-quality ratio. On the modern market, only 30% of products are purchased from natural materials.The bulk of trade turnover is made up of plastic.
Plastic accessories are convenient to carry and clean. Their cost is low, the consumer can choose any shape, color of the frame, temples. You need to buy glasses in specialized stores. When wearing them, there should be no inconvenience, discomfort, or pressure on the bridge of the nose or behind the ears.
You can find out your size at an optical store, choose glasses of the appropriate size and write down the parameters.
It is recommended to choose an accessory with hydrophobic lens coating. This improves image quality and reduces contamination. The hydrophobic layer is applied last in multifunctional lens coatings. It makes the device easier to maintain and reduces fogging.
When entering a warm room from frost, the lenses begin to fog up. As a result, light transmission decreases and discomfort appears when worn. The hydrophobic layer repels the resulting drops, so moisture does not spread over the glass.
When worn products that are too wide they will fall off your face. If you choose narrow models, they will begin to squeeze your temples, causing headaches.
Temples – an important element, they should not put pressure on the temple area. It is also important to make sure that the nose pads are not stiff.
Important! The size of glasses is indicated on the inside of the temple, but sometimes it is marked on the bridge of the nose. Most often it includes three numbers, after the first there is a square. Sometimes a fourth parameter is printed - the overall width of the frame.
Despite many factors, the main thing is so that it is equal to the width of the face. A deviation of 2 mm upward or downward is permissible. Compliance with the rule will not only make you look good, but will provide safety and convenience while wearing.
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