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[Effect of diffractive multi-focal lenses on contrast vision, glare sensitivity and color vision]
K Rüther1, D Eisenmann, E Zrenner
1Abt. für Pathophysiologie des Sehens und Neuroophthalmologie, Universitäts-Augenklinik, Tübingen.
Background:
Due to theoretical considerations an increase in the depth of field of the diffractive IOL may be combined with a reduction in contrast sensitivity, glare sensitivity and colour perception.
Patients And Methods:
A comparative analysis of both eyes was performed in ten patients with a diffractive multifocal IOL (3M 815LE) in one eye and a monofocal IOL in the other eye. Contrast sensitivity was examined by computer generated sine wave gratings of 6 different spatial frequencies; visual acuity with glare and glare sensitivity were determined under 7 different levels of field luminance; colour vision was examined using the Farnsworth-Munsell-100-Hue-test.
Results:
Contrast sensitivity of the diffractive lens was reduced for intermediate spatial frequencies, but not for low and high frequencies. Visual acuity with glare was only reduced at maximum field luminance; no differences were found in glare sensitivity and colour perception between monofocal and multifocal.
Conclusion:
Altogether, the diffractive lens did not show a dramatic reduction in the examined visual functions compared with the monofocal IOL.