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20 Cards in this Set
- Front
- Back
Transitions |
A brand name for lenses that turn dark when exposed to ultraviolet light |
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Photochromatic |
The ability to change color when exposed to ultraviolet rays |
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PGX |
A glass lens that can change color called photo grey extra |
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PBX |
A glass lens that can change color called photo brown extra |
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Silver halide crystals |
The glass ingredient that turns lenses dark |
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Polarized lenses |
Thin laminated process to block light in one meridian and allow light through in the meridian 90 degrees 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 |
Coating 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 glass lenses using to render them impact resistant |
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Colmascope |
Tool used to check if a 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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U.V. unit |
Hot U.V. liquid absorbed into the lens material |
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Tinting unit |
Hot color tints absorbed into the lens material |