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Often times, looking at your prescription information from your eye doctor can look like a foreign language. In this how to, we break down what numbers to look for and how to pick the correct prescription.
We typically offer nearsighted single vision lenses from -1.0 to -10.0 (**depending on mask model), and farsighted single vision lenses from +1.0 to +5.0 (**depending on mask model). Some mask models also offer a 'gauge reader' type of lens where the top part for distance is plano (clear), and the bottom part is magnified to assist with reading correction. So we have 3 types of stock lenses that we carry.
Negative numbers represent nearsighted, which means you have trouble seeing distance and it's easier for you to see near. Positive numbers represent that you are farsighted, which means you have difficulty seeing close up.
For Snorkeling, we usually recommend getting the distance portion of your prescription. For example, there is a nearsighted prescription below.
Ideally, the equation that we use is taking half the cylinder number (representing astigmatism) and minus or plus (depending on the sign) the sphere from it. So That would equal -2.5 for the right and -3.0 for the left.
For those who have good distance vision and need help with reading, our gauge reader lenses are ideal. We offer gauge reader magnification grades from +1.0 to +4.0, and it's around 30% of the bottom of the lens.