I sent my husband's prescription in to GetWetStore for a prescription mask. After the company representative reviewed his prescription, he wrote back that due to severe astigmatism, unless we ordered the exact prescription at a significant cost, the rep felt he may not see well. After speaking to my hubby, he gave the thumb's up for continuing with the order. The mask is just fine. The rep had explained that if it were not, we could send the mask back and order the more costly mask. This effort was greatly appreciated! We are looking forward to using the mask during our winter trip to the Caribbean.