Abstract
I investigated the discrimination of objects with diffractive bifocal contactlenses, when objects in different distances are presented simultaneously. Computer assisted considerations suggested an impairment of discrimination as compared to monofocal correction for far as well as for near. The theoretical loss of image information has been shown to occur also in a visual test with steric arrangement of object points. However, the experiments suggested, that this kinds of visual quality impairment does not play a dominant role in the qualification of diffractive bifocals, since a rather sophisticated procedure was needed to demonstrate the expected effect.
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