Distance and near contrast sensitivity function after multifocal intraocular lens implantation
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Published on: June 6, 2017
Robert Montés-Micó1, Jorge L Alió
1Research, Development and Innovation Department, Ophthalmologic Institute of Alicante, and the School of Medicine, University Miguel Hernández, Spain. roberto.montes@uv.es
Purpose:
To evaluate contrast sensitivity at distance and near after multifocal intraocular lens (IOL) implantation.
Setting:
Ophthalmologic Institute of Alicante, University Miguel Hernández, Alicante, Spain.
Methods:
Contrast sensitivity was measured with the Stereo Optical Functional Acuity Contrast Test at distance and near in 21 patients with a refractive multifocal IOL (Array SA-40N, AMO). A control group with a monofocal IOL (SI-40NB, AMO) was also studied to allow comparison of results. Contrast sensitivity was measured 1, 3, 6, 12, and 18 months after IOL implantation.
Results:
There was a statistically significant greater reduction in contrast sensitivity at distance at all spatial frequencies in the multifocal group than in the monofocal group during the first month. At 3 months, contrast sensitivity at 12 and 18 cycles per deg remained reduced in the multifocal group; contrast sensitivity at the other frequencies did not differ from that in the monofocal group (P > 0.1). At 6, 12, and 18 months, contrast sensitivity at all spatial frequencies was not significantly different between groups (P > 0.1). There was a statistically significant greater reduction in near contrast sensitivity in the multifocal group than in the monofocal group at all spatial frequencies during the first and third month after surgery (P <.01). No statistically significant differences were found between groups after 6 months (P > 0.1). Contrast sensitivity at distance and near in the multifocal group improved over time (P <.01).
Conclusions:
The Array IOL provided contrast sensitivity at distance comparable to that obtained with the monofocal IOL between 3 and 6 months after implantation. Near contrast sensitivity improved over time but was always lower than at distance and in the monofocal near-corrected patients, which is acceptable to avoid near visual function degradation.
