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Impressum
Near contrast sensitivity in a diffractive and refractive multifocal IOL
Italon C., Pieh S., Schmidinger G., Lackner B., Kaminski M., Skorpik C.
Universitätsklinik für Augenheilkunde und Optometrie, Refraktive Ambulanz, Wien, Österreich
Purpose: To compare near vision quality of two different intraocular
multifocal concepts.
Methods: In 11 eyes 10 patients with a diffractive multifocal IOL
(811E , Pharmacia) and 12 eyes of 9 patients with a refractive multifocal
IOL (SA 40N, Allergan) the best corrected visual acuity was determined.
Using the near contrast visual acuity charts (Holladay) the contrast sensitivity
over the near focus was determined in a distance of 40 cm.
Results: The best corrected visual acuity in the diffractive group
was Snellen 0.94 ± 0.13 in the refractive group Snellen 0.90 ±
0.08. The contrast sensitivity was in the refractive group at 100% 12.53
lines ± 1.24, at 50 % 10.84 lines ± 0.86, at 25 % 9.33 lines
± 1.38, at 12.5 % 8.36 lines ± 1.48 und at 6.25 7.07 lines
± 1.29. In the refractive group at 100% 10.08 lines ± 1.03,
at 50 % 8.88 lines ± 0.80, at 25 % 7.58 lines ± 1.05, at
12.5 % 6.65 lines ± 1.04 und at 6.25 % 5.73 lines ± 1.06.
The evaluated contrast differences were statistically significant at all
contrast levels.
Conclusion: The near contrast sensitivity in the diffractive multifocal
lens is significant better.