masks. safety features tempered glass lens nose coverage allows you to equalize the pressure in your...
DESCRIPTION
Testing Mask Fit Proper fit is the most important consideration when selecting your mask***. Hold the mask against your face without using the strap. –Inhale lightly through your nose. –The mask should suck in against your face –No air should leak into the mask –The mask should remain sealed to your face for at least a few seconds after you stop inhaling through your noseTRANSCRIPT
Masks
Safety Features
• Tempered glass lens• Nose coverage
– Allows you to equalize the pressure in your mask
• Wide or split strap• Non-corrosive retaining band
Testing Mask Fit
• Proper fit is the most important consideration when selecting your mask***.
• Hold the mask against your face without using the strap.
– Inhale lightly through your nose.– The mask should suck in against your face– No air should leak into the mask– The mask should remain sealed to your face for at
least a few seconds after you stop inhaling through your nose
Mask Styles and Features
• Low volume vs. high volume• Purge vs. non-purge• Side windows vs. non-side windows• Clear skirt material vs. non-clear• Split lens vs. single lens• Lens coatings• Optical correction• Frame vs. Frameless
Mask Volume
Low Volume• Often used in breath
hold diving.• Streamlined• Less air to equalize or
clear• May offer smaller field
of vision
High volume• Used more often in
scuba• More open• May offer greater field
of vision• Less streamlined• More air to equalize
or clear
Single vs. Split Lens
Single Lens• Broad uninterrupted
view• Greater volume?
Split Lens• Lower volume
Side Windows vs. No Windows
Side Windows• Greater field of view• Can be distracting
No side window• Focused field of view• May feel confining
Skirt Material
Clear skirt• Very Bright• Lens may act as
mirror
Black skirt• Prevents effect• My feel confining
Purge
Purge• Hands free clearing• May block access to nose• May leak
Frameless
• Reduced weight• Reduced volume• Comfort
Lens Coatings
• UV protection• Improve depth perception• Define faint edges• Maximize available light• Restore: yellows, oranges, and reds• Minimize glare
Optical Correction
• Soft contacts• Standard corrective lenses• Prescription masks
De-Fogging Techniques
• Scrub with toothpaste/TSP• Defog Solutions
– Commercial– Home Made
• Saliva
Objectives
• Identify the required safety features of a mask.
• Describe how to properly fit a mask to your face.
• Describe how to adjust your mask strap.• Compare various styles of masks.• Describe techniques for defogging your
mask.