Diving masks designed for scuba dives or snorkeling, tend to be large and squarish. They come up high and go across the forehead and dip down low, almost to the bottom of the nose. Rubber surrounds the outside areas of the mask to fit tightly against the face and provide a watertight seal.
Prescription scuba diving masks work in one of two ways: either the entire lens area is a prescription lens, or the Rx lenses are inserted separately between the mask and the wearer‘s eyes. This eliminates the possibility of water leaking in around the lenses; however, depending on the depth, temperature and type of water that you will be diving in, fogging may be a bit more problematic with inserts.
If the dive mask comes with prescription lenses, they may be either made specifically to your measurements and correction, or they can come premade in a prescription that is the same for both eyes.
Most people who require visual correction have a similar prescription for both eyes, and a dive mask with a premade Rx that is the same on either side generally gives you adequate vision for reading gauges and maneuvering around underwater. Even though premade prescription lenses do not have any astigmatism correction, most people who have regular glasses that correct for small amounts of astigmatism do not suffer when wearing a spherical (meaning "without astigmatism") correction in the water.
To discuss the right sports eye wear for you, pop into Specs of Kensington and one of our professional dispensing opticians will guide through our selection of frames making sure that you get the perfect pair of sporting eyewear for your face shape and life style. You can also book an eye test to see whether your prescription has changed.