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20 Cards in this Set
- Front
- Back
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Transitions |
Band name for glasses. Dark when exposed to UV light |
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Photo chromatic |
Ability to change color when exposed to UV light |
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PGX |
Photo grey extra, glass lens that can change color |
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PBX |
Photo brown extra, glass lens that can change color |
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Silver halide crystals |
Glass ingredient that makes the lens turn dark |
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Polarized lenses |
Laminated process to block light in one Meridian and allows light through the other meridian 90° away |
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Presbyopia |
The crystalline lens loses its elasticity and a bifocal must be used to aid vision for near tasks |
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G-15 |
Dark green colored lens made popular by the military |
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Anti-reflective coating |
Coding to reduce reflection and increase transmission |
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Drop ball test |
Impact test for treated glass lenses |
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Lens caliper |
Tool used to measure the thickness of a lens |
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Heat treating |
Tempering process for glass lenses using heat to render them impact resistant |
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Chemical tempering |
Tempering process for a glass lenses to render them impact resistant |
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Colmascope |
Tool used to check if glass lens has been safety tempered or is under stress |
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Polariscope |
Same as colmascope |
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Gradient lens tint |
Gradual change of darkening of the same color of tint on one lens |
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Double gradient tint |
Gradual change from one color to another on the same lens |
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Neutralizer |
Hot liquid to take out the tint color of a lens |
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UV unit |
Hot UV liquid absorbed into the lens material |
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Tinting unit |
Hot color tints absorbed into the lens material |
