This is the Sherwood Oracle+ Bifocal +1.75 Diopter Two Lens Scuba Diving Snorkeling Mask Features: Sherwood&';s best selling and best fitting masks, the Sherwood Oracle Now with +1.75 Positive Diopters located at the base of each lens Its unique design provides tremendous comfort Distinctive shape provides superior field of vision Tempered glass lenses prevents distortion and fogging Easy access nose pocket for single handed equalizing Convenient quick disconnect buckles Highest quality silicone skirt and strap For those of you looking for a little extra strength reading when looking at your Computer or Gauge, Sherwood has the mask for you.