[The impact of implantation of intraocular lenses with negative spherical aberration on contrast sensitivity].
OBJECTIVE
The aim of study was to compare contrast sensitivity (CS) and central visual acuity (CVA) after implantation intraocular lenses (IOL) with negative spherical abberation and spherical IOL at the different light conditions.


METHODS
14 patients (28 eyes) were evaluated in the prospective study during period 12/2008 - 01/2009. They have implanted in one eye spherical IOL (acrylic or PMMA) in past.The hydrophobic IOL Tecnis 1 with negative spherical abberation was implanted to the second eye. The phacoemulsification was done and the IOL was implanted by injector. CVA and CS were evaluated and compared between two eyes at the same patient at the exactly measured light conditions one month after surgery.The digital Multimeter P5025 was used for measurement of light conditions in testing room. The examination of CS was done on Topcon C 100, methods of stimulation with frequency lines and Landolt circles with different contrast. Patients have been evaluated about quality of vision by Visual functioning test VF-14.


RESULTS
The best corrected CVA was same at the different light conditions on both eye at the same patient. 12 patients have CVA 1.0, and 2 patients have CVA 0.8. Contrast sensitivity was better at the eyes with IOL with negative spherical abberation at the different light condition. The regres statistic analysis was used for statistic evaluation of results, program Statgraphic Plus. The difference between CS tested with lines was significantly better at the eyes with IOL with negative spherical aberration for p < 0.05. Coefficient of correlation r was 0.9835 for photopic conditions, 0.9969 for mesopic and 0.984 for scotopic conditions. Difference at the CS was statistically significant at the examination with Landolt circles too, for p < 0.05. Coefficient of correlation r was 1.00 at the photopic conditions, 0.7385 at mesopic and 0.5415 at scotopic conditions. All the patients indicated improved of vision. VF-14 index was increased.


CONCLUSIONS
We can refer better contrast sensitivity at the different light conditions at eyes with IOL with negative spherical aberration Tecnis1, based on the results of group of 14 patients.
Ocné oddelenie NsP Sv. Lukása, Galanta, Slovenská republika.
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M
Ilavská
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Ilavská
D057128:Aberrometry; D015350:Contrast Sensitivity; D006801:Humans; D019654:Lens Implantation, Intraocular; D018918:Phacoemulsification; D014787:Vision Tests; D014792:Visual Acuity