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CR-39 Plastic Lenses
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Next - Select Single Vision, No-Line Progressive, Lined Bifocals or Trifocals
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Do you need Single Vision, Progressive no-line lenses, lined Bifocals or Trifocals?
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Below is a description of the different types of plastic lenses available for your glasses.
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Recommended prescription
range for CR-39 Plastic Lenses:
Sphere below + or - 1.00
Cylinder below + or - 1.00
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Select the lens that best describes the type you require.
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Plastic Progressives
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Plastic Single Vision
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Progressive Lenses have no visible lines and provide a smooth gradual progression of power from distance vision on top through intermediate vision to near vision on bottom. Progressives have multiple focal areas unlike lined bifocals or trifocals which have only two or three.
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Single Vision Lenses are prescribed if you need correction for one field of vision, either for distance only, intermediate only (computer), or reading only (near vision). Eyeglass Lens Direct offers a number of options for the single vision lens wearer.
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Plastic Bifocals
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Plastic Trifocals
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Bifocal Lenses contain two different prescriptions in the same lens. The primary purpose of bifocal glasses is to provide an optimal balance between the top area of the lens and the lower segment area of the lens. Bifocal lenses are available in a variety of segment shapes and widths. The most popular bifocal segment style is the Flat-Top 28 also known as straight-top or D-segment.
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Trifocal Lenses contain three focal points, usually for distance, intermediate and near vision. A trifocal lens has an added segment above the bifocal for viewing objects in the intermediate zone, which is approximately arm's length away. Trifocal lenses are available in a variety of segment shapes and widths. The most popular trifocal segment style is the Flat-Top 7 by 28 also known as straight-top or D-segment.
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Plastic Computer Lenses
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Plastic Occupational Lenses
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No-Line Computer Lenses are an occupational progressive lens, a no-line multi-focal that corrects near, intermediate and, to a degree, distance vision. It has a larger intermediate zone than regular progressive lenses, leaving less space for distance. Computer eyeglass lenses are generally not suitable for driving or regular wear.
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Occupational Lenses are special bifocal and trifocal multifocal lenses that are designed for specific jobs or hobbies, but typically are not for everyday wear. They are special because of the unusual placement of the near, intermediate and far vision zones in the lenses, to make certain tasks easier.
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