Stereo-Acuity in Patients Implanted with Multifocal Intraocular Lenses: Is the Choice of Stereotest Relevant?
Por:
Varon, C, Gil, MA, Alba-Bueno, F, Cardona, G, Vega, F, Millan, MS, Buil, JA
Publicada:
1 jul 2014
Resumen:
Purpose: A randomized and double-blinded study design was implemented to assess the stereo-acuity in patients symmetrically implanted with four types of multifocal intraocular lenses (MIOLs), compared to a monofocal lens (control group). In addition, the influence of the type of test employed for the evaluation of stereo-acuity was explored.
Materials and Methods: Six months after cataract intervention, stereo-acuity was measured with the Titmus and TNO stereotests in 143 patients implanted with one of the following MIOL lens types: hybrid spherical SN60D3, hybrid aspheric SN6AD1, diffractive aspheric ZMA00 and refractive spherical NXG1. A control group implanted with the monofocal aspheric ZA9003 (in which stereo-acuity was measured with a near addition) was also included in the study.
Results: Statistically significant better stereo-acuity was found in the monofocal group with both stereotests (except for the SN60D3 group with the Titmus test) (all p<0.001). No significant differences in stereo-acuity between MIOLs were found using the Titmus test. However, with the TNO, patients implanted with hybrid diffractive MIOLs exhibited statistically significant worse stereo-acuity than those with the refractive design (SN60D3, p<0.001; SN6AD1, p = 0.006).
Conclusions: Patients implanted with MIOLs have worse stereo-acuity than those implanted with monofocal IOLs due to the decrease in retinal image contrast originating in the simultaneous presence of two images. Awavelength-based stereotest such as the TNO induces large differences in image contrast between fellow eyes implanted with diffractive-based MIOLs, which may result in an underestimation of the real stereo-acuity of the patient.
Filiaciones:
Varon, C:
Tech Univ Catalonia, Dept Opt & Optometry, Terrassa, Spain
Gil, MA:
Santa Creu & St Pau Hosp, Barcelona, Spain
Alba-Bueno, F:
Tech Univ Catalonia, Dept Opt & Optometry, Terrassa, Spain
Cardona, G:
Tech Univ Catalonia, Dept Opt & Optometry, Terrassa, Spain
Vega, F:
Tech Univ Catalonia, Dept Opt & Optometry, Terrassa, Spain
Millan, MS:
Tech Univ Catalonia, Dept Opt & Optometry, Terrassa, Spain
Buil, JA:
Santa Creu & St Pau Hosp, Barcelona, Spain
Open Access
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