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| 'e'-value |
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| Conventional contact lenses typically include an aspheric progressive multifocal zone that is formed by rotating a conic section about a central axis. As used herein, the term "conic section" refers to a curve that results from intersecting a cone with a plane at any angle. A conic section may be mathematically defined in terms of "eccentricity", which is the variation in the shape of an ellipse and is numerically always less than one. |
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This feature will be shown at London Eyewear with the following icon:
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'e'-value
Corneal Eccentricity |
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• Find Contact Lenses with special 'e'-value in the Advanced Search
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Highlight of the month |
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Focus Night & Day
by Ciba Vision
 For Wearing Night and Day
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£ 40.00 |
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[ Details ] |
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