Abstract
BackgroundTo evaluate binocular visual outcome for near, intermediate and distance compared to monocular visual outcome at the same distances in patients implanted with a diffractive trifocal intraocular lens (IOL).MethodsThe study comprised of 100 eyes of 50 patients that underwent bilateral refractive lens exchange or cataract surgery with implantation of a multifocal diffractive IOL (AT LISA tri 839MP, Carl Zeiss Meditech, Germany). A complete ophthalmological examination was performed preoperatively and 3 month postoperatively. The main outcome measures were monocular and binocular uncorrected distance (UDVA), corrected distance (CDVA), uncorrected intermediate (UIVA), and uncorrected near visual acuities (UNVA), keratometry, and manifest refraction.ResultsThe mean age was 59.28 years ± 9.6 [SD] (range 44–79 years), repectively. There was significant improvement in UDVA, UIVA, UNVA and CDVA. Comparing the monocular results to the binocular results there was a statistical significant better binocular outcome in all distances (UDVA p = 0.036; UIVA p < 0.0001; UNVA p = 0.001). The postoperative manifest refraction was in 86 % of patients within ± 0.50 [D].ConclusionsThe trifocal IOL improved near, intermediate, and distance vision compared to preoperatively. In addition a statistical significant increase for binocular visual function in all distances could be found.Trial registrationGerman Clinical Trials Register (DRKS) DRKS00007837
Highlights
To evaluate binocular visual outcome for near, intermediate and distance compared to monocular visual outcome at the same distances in patients implanted with a diffractive trifocal intraocular lens (IOL)
In the field of lens surgery the use of multifocal IOLs has shown that it can improve uncorrected near visual acuity (UNVA) and uncorrected distance visual acuity (UDVA) and reduce spectacle dependence [2–6]
Regarding uncorrected intermediate visual acuity (UIVA) a great variability in results has been observed with the use of different multifocal IOL models
Summary
To evaluate binocular visual outcome for near, intermediate and distance compared to monocular visual outcome at the same distances in patients implanted with a diffractive trifocal intraocular lens (IOL). In todays world patients’ expectation in regards to refractive outcome and spectacle independence have increased substantially and even cataract patients have the same demands as refractive patients For the ophthalmologist this means that the final goal is to achieve an accuracy of the target refraction with less than ±0.5 D postoperatively [1]. In the field of lens surgery the use of multifocal IOLs has shown that it can improve uncorrected near visual acuity (UNVA) and uncorrected distance visual acuity (UDVA) and reduce spectacle dependence [2–6]. Toward this purpose, many designs based on different optical principles have been applied in the manufacturing of IOLs. Basically, four types of IOLs are available; refractive, diffractive, refractive–diffractive, and accommodating. Improvement in intermediate vision is still needed to increase the level of patient satisfaction
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