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Contents
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(Top)
1
Prescription of corrective lenses
Toggle Prescription of corrective lenses subsection
1.1
Over-the-counter correction
1.2
Self-selected corrective lenses
2
Lens types
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2.1
Single vision
2.2
Bifocal
2.3
Trifocal
2.4
Progressive
2.5
Multifocal
2.6
Adjustable focus
2.7
Plano
3
Lens optical profile
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3.1
Bifocals and trifocals
3.2
Progressive lens
4
Vertex distance
5
Refractive index
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5.1
Advantages of higher indices
5.2
Disadvantages of increased indices
6
Optical quality
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6.1
Abbe number
6.2
Power error
6.3
Lens induced oblique astigmatism
6.4
Minimizing power error and lens induced astigmatism
7
Cosmetics and weight
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7.1
Reducing lens thickness
7.2
Weight
7.3
Facial distortion and social stigma
8
Lens materials
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8.1
Optical crown glass
8.2
Optical plastics
8.2.1
CR-39
8.2.2
Trivex
8.2.3
Polycarbonate
8.2.4
High-index plastics (thiourethanes)
8.3
Ophthalmic material property tables
9
Lens coatings
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9.1
Anti-reflective
9.2
Ultraviolet protection
9.3
Scratch resistance
10
Confusing corrective lens industry terminology
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10.1
Spheric vs. aspheric, atoric, etc.
10.2
Optical aberrations of the eye lens vs. corrective lens
10.3
Astigmatism disambiguation
10.4
Aspheric and atoric disambiguation
11
U.S. legal requirements for prescriptions
12
See also
13
References
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Corrective lens
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