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Executive d-seg trifocal
| Глоссарий терминов и сокращений по оптическим линзам |
A plastic trifocal with a flat top 25 mm seg style set inside the intermediate executive style area.
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Intermediate, английский
- Between two others.
- Промежуточный
- Промежуточное звено
- Chemical term for an igneous rock containing 54 to 62% silica and usually
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Executive trifocal, английский
There are two ledges across the lens that represent the bifocal and trifocal area for distance, intermediate, and near viewing areas.
Executive bifocal, английский
A one-piece bifocal that incorporates the total bottom portion of the lens for close vision with a visible dividing line across the entire lens. it is thicker and heavier than flat top styles and discouraged because of these drawbacks.
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