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Let you easily see the aquatic animals and plants, when you try to open your eyes in the water, you can only see a piece.The blurry vision is because the density of water is greater than that of air, and light will refract when it enters the water. The focal length of the eyes is adjusted based on light in the air, so the face mirror leaves a cavity in front of your eyes, allowing you to have clear vision. The main difference between a face mirror and a swimming goggle is that the former not only covers the eyes but also covers the nose. This is because when diving, to prevent compression, it is necessary to balance the pressure in the nasal cavity, so swimming goggle cannot be used for diving. A general face mirror consists of reinforced safety glass lenses, silicone or rubber rim that fits the face shape, and a adjustable headband that can fix the position. Reinforced safety glass lenses can prevent the breakage into highly dangerous long glass fragments. The material of the rim, silicone, is stronger than rubber, because silicone is more durable than rubber.4 倍, not easy to cause skin allergy, more soft and comfortable. Some face masks are equipped with drainage valves, which are one-way valves used to drain water from the mask. The two most important factors to consider when choosing a mask are suitability and comfort, as is the case with other equipment. An inappropriate mask may leak or cause allergies, reducing the fun of scuba diving. To test the suitability of a mask, simply gently place the mask on your face (without wearing the head strap), then inhale through your nose. A suitable mask will stay firmly on your face until you exhale. One more thing to note is to ensure that you can easily pinch your nose outside the mask. There are a variety of styles of masks, including single-lens, two-lens, and multi-lens models. Typically, only models with two lenses are equipped with corrective lenses.

When you rest on the surface of the water or float, looking down or searching for something when your face is in the water, you can breathe through the snorkel.Suck. Secondly, when there are waves on the surface of the water, you can use the height of the mouth of the snorkel to be usually higher than the height of the waves to avoid water entering your mouth. When snorkeling, a snorkel is an essential piece of equipment. You can stay underwater without raising your head to the surface for an entire day. The general design of a snorkel is one end with an opening and the other end with a bent tube with a mouthpiece. The upper part of the snorkel (the tube body) is usually a semi-rigid plastic tube, and the lower part of the mouthpiece is made of silicone. A suitable snorkel should have an appropriate curve (suitable for your own face shape), an inner diameter of about 2 centimeters, and a length of 30-35 centimeters. A suitable snorkel should be not only comfortable but also easy to breathe. When trying it, you can put the mouthpiece between your lips and teeth, place the tube body in front of your left ear, and the mouthpiece should be comfortable and suitable, not scratching your mouth or causing fatigue in your chin, and it should be straight in your mouth.

The practice of draining a face mask must first assume that the face mask is flooded to avoid the potential danger of choking. In addition, cramps caused by improper use of frog shoes may also cause the practitioner to experience drowning. Therefore, when practicing skills, it is recommended to hire a professional coach to guide, which can minimize the incidence of accidents in the activity. As for the scuba diving skills, they can be roughly divided into:

Although I chose a pair of goggles that fit my face well, there are always some external factors that cause the goggles to fill with water when I am snorkeling on the surface of the water. If the water cannot be discharged or continues to enter, it is necessary to pay attention to whether there are the following problems:

1. Is the position of the face mirror worn correctly.

2. Is there any hair or foreign object between the mirror and the face?

3. Whether the nose breath is light and sustained.

The chance of the breathing tube filling with water is very high, as long as the angle of wear is incorrect or there is a slight wave, it will cause the breathing tube to fill with water. In addition, when rising from the bottom to the surface, the breathing tube will fill with water. At this time, you can use the drainage technique to drain the water from the breathing tube and continue to perform breathing movements.

There are two ways to drain water from a breathing tube:

1. Jet breathing is the process of forcefully expelling air from the lungs through the mouth, often with a short, powerful exhalation. Due to the design of most modern respirators with drainage valves, one does not need to exert too much force when breathing.

2. Gas expansion is a technique designed for breathing tubes without drain valves that are used when divers rise after diving. During the ascent to the surface, first exhale some air into the tube, and look up towards the surface, waiting until the water in the breathing tube is naturally expelled by the expanding air.

The differences between activities in water and on land are very significant, especially because of the greater resistance in water, which makes it more strenuous to move around. Therefore, it is necessary to take in a large amount of oxygen. That's why proper breathing control is also a way to reduce the production and accumulation of carbon dioxide.

There are two ways to control breathing:

1. Diaphragmatic breathing refers to the deep inhalation when diving at the surface, which is deeper than normal inhalation. Since inhalation is deeper, the speed is slower, and the breathing pattern of free diving will slow down due to the slower breathing speed. However, it can increase the amount of gas exchange and relative reduction of residual air.

2. Rapid breathing This breathing method is used when swimming rapidly on the surface. The rate of breathing can be adjusted to match the speed of the kick with a frog shoe, but rapid movements and breathing cannot be sustained for long. If used over long distances or for extended periods, it may lead to hypoxia.

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