Generally, diving goggles are divided into two types: single-sided mirror and double-sided mirror. A single mirror is a whole piece with no division in the middle. The double-sided mirror is a piece on the left and a piece on the right, with an interval between them. Of course, both have their own advantages and disadvantages in use. Among them, the biggest feature of single-sided mirror is wide field of vision, but at the same time, for the glasses family, there are few single-sided lenses with power, and the single-sided mirror is also heavier than the double-sided mirror. The biggest advantage of the double-sided mirror is that many lenses have power, and the weight is relatively light, but the field of vision may be slightly inferior to that of the single-sided mirror.
However, no matter which type of mask you prefer, many factors should be considered in the selection, starting with the material：
First, the lens is preferably made of glass. The general diving mask is made of optical glass instead of crystal glass. The crystal glass is harder and more wear-resistant. The optical glass is too soft. Moreover, the special diving mirror lens has a special coating, which can prevent the generation of fog.
Second, the corners of the face mirror must be soft and comfortable, and can fit your face. The best choice is silicone material, which is not only soft but also durable. At present, rubber face mirrors are rare, because some people's skin is allergic to rubber, and rubber is very easy to age and has a short life.
Third, there must be a "nose pinching" design that can directly pinch the nose from outside the face mirror. When diving, when the water pressure increases, the ears will be squeezed. Divers often need to hold their noses and inflate to balance.
Fourth, we should have a broad vision. Those who are engaged in diving activities should choose the goggles produced by professional diving equipment manufacturers. On the one hand, its material is better and it is more comfortable to use under high-pressure environment. More importantly, this kind of surface mirror has strict quality control in the manufacturing process, which can ensure the safety in use.
There has been an incident that a diver used a face mirror without a brand and the lens fell off during diving. Therefore, when buying face mirrors, you must not sacrifice your own safety in order to save money.
Finally, a suitable face mirror can be selected mainly according to the following points: fitting the face shape, pinching to the nose, material, design and myopia.
- Fitting face shape
First move the mask belt to the front of the lens without wearing it on the head, then wear the mask and suck the mask with your nose (keep sucking), look down and shake your face to see if the mask will fall off. If not, it means the mask is suitable for your face shape. If the mask does not fit your face, it means air leakage. In this way, there will be constant water leakage when you dive. It is better to wear the mask to cover the eyebrows and nose completely.
- Being able to squeeze your nose
You will learn how to balance your ear pressure when diving. One way is to squeeze your nose to inflate. If you choose a mask that cannot squeeze your nose, your ear pressure will not be able to do it, and your diving will not continue smoothly. Method: directly wear the upper mirror and try to see if it is pinched to the nose. It is very simple!
*If the balance of ear pressure cannot be achieved, the symptoms of ear pain will appear. Remember not to use excessive force to do ear pressure, which will cause injury to the ear blood vessels. Try to do ear pressure balance when it rises to a less painful position!
- Materials:
Silica gel, plastic, stainless steel, tempered glass, these are the main materials of the face mirror. The price of the face mirror ranges from 30 pieces to 200 pieces. The durability of a face mirror can be maintained for about 1-2 years, which depends on your usage rate. Therefore, the quality of the face mirror is also determined by the material. Remember that the mirror that suits you, whether it is expensive or cheap, is the best.
- Design and myopia
There are various styles of face lenses, which can be divided into single lens and double lens. Of course, the single lens will have a better field of vision, and there is a barrier between the two lenses. Some also have UV resistant designs. What do you need to prepare for diving if you are short sighted? You can wear contact lenses when diving, but you need to close your glasses when doing some facial lens skills to avoid the contact lenses from being washed out or becoming uncomfortable. Of course, there is another method, that is, directly replace the lenses with power. The power lenses are already produced, so they can be directly replaced in the store, which is very convenient.