The second feature that you should look at is accessibility to your nose. While mask is on, try to pinch your nose. By pinching your nose we mean that both your nostrils can be closed. This is essential if you are scuba diving as you need to pinch your nose to equalize air pressure as you are descending deep into waters.

If you have difficulties pinching your nose or can not even reach your nose at all, that mask will not work for you.

Another thing to look for but may not be as important is visibility. You should have adequate peripheral vision and not tunnel vision with mask. A good method of checking your peripheral vision is following:

With your mask on, point your arm straight out in front of you with palm of your hands together as if you’re about to diving into a swimming pool. At this point you should see your hands.

Next, while looking straight ahead, slowly open your hands and arms apart moving them away from each other. Keep going until you no longer see hands and arms. That angle in which you can no longer see your arms is angle of peripheral vision.

A good range is between 100 degrees and up. Normally your peripheral vision without mask is close to 180 degrees.

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