The human eye cannot focus in water. The Scuba Diving Mask provides an air pocket so your eyes can focus and you can see clearly underwater. Your nose must be within the eye pocket so you can adjust for pressure changes. This is why swim goggles cannot be used for Snorkeling. Look for Tempered glass - Plastic fogs up and standard glass is hazardous if accidentally broken. Desirable features: Feathered, double skirt - Makes mask seal more reliable and comfortable, Wide strap with touch buckle adjustment - Mask adjusts quickly, easily and stay adjusted
Enclosed nose - Your nose must be within the eye pocket so you can adjust for pressure changes. This is why swim goggles cannot be used for scuba diving.
Tempered glass - Plastic fogs up and standard glass is hazardous if accidentally broken.
Desirable features: (found in virtually all masks intended for scuba diving)
Feathered, double skirt - Makes mask seal more reliable and comfortable
Wide strap with touch buckle adjustment - Mask adjusts quickly, easily and stay adjusted during the dive.
Shapes eye panel - for maximum viewing angle up and down and side to side.
Low volume - The smaller the mask, the less drag it has while diving. Your face may require something a bit larger, so don't consider this an absolute.
Purge valve - Use to blow water out (but you can do this easily without a valve)
Special lenses - Some masks can be fitted with prescription lenses, which is convenient if you wear glasses or use contacts.
|Two window masks are characterized by two separate panes of glass held together by a frame which separates the windows. Depending upon the design, these masks can bring the the lenses very close to the divers face and help reduce the internal volume of the mask, which makes it easier to clear and to equalize. When selecting a two window mask, make sure that the mask frame does not press against the bridge of your nose.|
|Single window masks have one continuous pane of tempered glass. For many divers, it is easier to see out of this style of mask than out of a two window mask because there is no frame running between the diver's eyes. Depending upon the design and fit of a single window mask, it can leave plenty of space between the the lens and the bridge of a diver's nose, or it can run right up against it.|
|Side window masks have two additional panes of glass arranged on the sides of the mask. The side windows allow additional light into the mask, and increase the diver's field of vision. These masks tend to have a larger internal volume (hold more air) than other mask styles, which means they require more air to equalize and clear of water.|
|Mask with purge a purge valve is a one-way valve built into the nose of a mask to facilitate clearing water from the mask. It eliminates the need for a diver to look up when clearing his mask. While some divers love this feature, many feel it is unnecessary. Purge valves can make it more difficult pinch the nose during equalization. They add an extra failure point to the mask, because if they break (which is uncommon) the whole mask will flood. A purge valve is an additional luxury or a unnecessary excess, depending upon the point of view.|
|Color Correcting Lenses are specially formulated to pick up red (lost at ten feet) and yellow (lost at twenty feet) and define objects and give better depth perception.
|Corrective lenses many manufacturers offer masks which can accommodate a wide variety of corrective lenses. Divers who wear glasses or contact lenses should consider requesting a mask with this capability. Dive shops can sometimes order masks with a customized prescription directly from the manufacturer. Some masks are created so that the user can change the lenses with just a screwdriver.|
For most people, the problem in choosing a mask is deciding which one you like best rather than finding the right mask with the perfect fit for your face
After purchasing a new mask scrub out the mask and use defog. Mask fog plagues beginning divers, but it's actually easy to prevent. First, scrub out a new mask with soft scrub, toothpaste or as recommended by the manufacturer. This removes a chemical that sometimes coats the glass during manufacturing and causes fog up. You only need to do this when you get the mask. Then, before each dive, use defogging solution according to the instructions. Your mask will stay fog-free.
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