Promate Scope Scuba Dive Snorkel Mask/MK650 & Optical Corrective Lenses:
*Ideal for medium faces (fits almost everyone) - face seal size W4 1/2 * H3 3/8
*Unique purge design design
*Crystal, liquid silicone injected skirt and strap
*Double edge comfort seal
*Ultra low volume
*Broad peripheral view
*Optical lenses available from –1.0 to –10.0 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 lenses available in +1.0, +1.5, +1.75, +2.0, +2.25, +2.5, +2.75, +3.0,+3.5 +4.0 (gauge reader)
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 order corner and the height is from the eyebrow to under the nose.