Mask - the window of underwater world

Trying to open your eyes in the water, you can see only a vague scene, this is because the density of water than the air, the light into the water there will be refraction. The focal length of the eye is adjusted according to the light in the air, so the mask keeps the cavity in front of you and gives you a clear view. The biggest difference between a mirror and a swimming goggles is that the former not only covers the eyes but also covers the nose because the swimming goggles can not be used for diving in order to prevent squeezing and to balance the pressure in the nasal cavity during diving

General mirror by the enhanced safety glass lenses, fit the face of the rubber or silicone group edge and can be fixed position adjustment headband. Enhanced safety glass lenses prevent fragmentation into highly dangerous slender glass shards. Group side of the silicone material is stronger than rubber, which is 3-4 times more durable than rubber, not easy to make the skin allergic, more soft and comfortable. Some mirrors have a drain valve, is a one-way valve used to exclude water within the mirror. The two most important choices for face masks are the right and the easiest to do, as do the other equipment. An inappropriate mirror may leak and may cause allergies, reducing the diving fun.

Test mirror appropriate or not, as long as the mirror gently on the face, (do not have to bring the headband) and then inhale with a nose, a suitable mask will cling to your face until you exhale. Another point to note is to make sure you can easily pinch your nose outside the mask. There are many styles of masks, such as single lenses, two lenses and many lenses. Usually only two lenses have lenses that can correct vision.

Before using the mask for the first time, use a soft cloth with a toothpaste to gently wipe both sides of the lens to remove the protective film. Mirrors need to be thoroughly cleaned with clean water after each use, placed in a dry and ventilated place, do not be exposed to direct sunlight. If you are using the mirror in the sea, it is best to soak in warm water for a few minutes to prevent the generation of corrosive scale. If you can not clean immediately after use, it is best to put the mirror in the water, because the removal of salt is difficult to completely remove.