Correction of the Mobile Eye (Near Vision—Astigmatic Eye)
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When a lens that was calculated to correct oblique astigmatism in far vision is used for near vision a slight astigmatism results, usually negligible owing to the accommodation of the subject. For example, for an object 33 cm from the lens and at ω′ = 30°, a punctual lens of the Ostwalt type with a power-10 D produces 0.13 D astigmatism, which is not noticeable.
KeywordsSpherical Lens Flint Glass Continual Variation Oblique Defect Principal Section
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