W3 Lens Curvature
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Last updated 10:03 PM on 1/19/26
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4 Terms
1
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What is the structure of a spectacle lens?
MOST have a positive front surface and a negative back surface
2
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What is curvature?
The reciprocal of the radius of curvature (metres)
3
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What is the relationship between curvature and surface power?
Greater the curvature higher the surface power
4
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What do we assume n’ to be when using lens measure?
1.523, this however reduces accuracy
Note 
Flashcards (33)