Influence of lens vertex distance changes on prismatic effect and decentration.
Changing the lens vertex distance alters the effective power of a lens, both in refractive and prismatic effect. For spherical lenses under paraxial conditions, it was found that though the amount of incorporated prism should be modified in the correcting lens in cases of vertex distance changes, the actual amount of decentration should be kept constant.
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Department of Diagnostic Sciences, Hong Kong Polytechnic, Kowloon.
D005139:Eyeglasses; D006801:Humans; D008433:Mathematics; D055095:Optics and Photonics; D014785:Vision, Ocular