Promate Fish Eyes R/X Prescription Scuba Dive Snorkeling Mask - MK260 RX

• Newly designed easy adjust buckle system with push button adjustment and all direction swivel functions.
• Extra wide and long lenses provide wider peripheral view and downward vision.
• Ideal for medium faces - face seal size W4 1/2 * H3 1/2.
• Crystal, liquid silicone injected skirt and strap.
• Double edge comfort seal.
• Ultra Low volume.
• Tempered glasses.
• Optical lenses available from -1.0 to -8.5 by increments of 0.5 (for near sighted).
• Optical lenses available from +1.0 to +4.0 by increments of 0.5 (for far sighted).
• Bifocal / Gauge Reader lenses available from +1.0 to +4.0 by increments of 0.5.

How to measure your face to see if this mask fit you.
If you look in the description there is a face seal size. You would need to measure the width and height of your face. Width is from one outer corner of the eye to the other outer corner and the height is from the eyebrow to under the nose.