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Stereo-Acuity in Patients Implanted with Multifocal Intraocular Lenses: Is the Choice of Stereotest Relevant?
Varón Puentes, Maria Consuelo; Gil Arnal, Miguel Ángel; Alba Bueno, Francisco; Cardona Torradeflot, Genís; Vega Lerín, Fidel; Millán Garcia-Varela, M. Sagrario; Buil Calvo, José Antonio
Universitat Politècnica de Catalunya. Departament d'Òptica i Optometria; Universitat Politècnica de Catalunya. GRCUV - Grup de Recerca del Centre Universitari de la Visió; Universitat Politècnica de Catalunya. GOAPI - Grup d´Òptica Aplicada i Processament d´Imatge
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.
Àrees temàtiques de la UPC::Ciències de la visió::Optometria
Intraocular lenses
Cataract surgery
chromatic aberration
diffractive optics
multifocal intraocular lens
Cataractes -- Cirurgia
Ulls -- Acomodació i refracció
Lents intraoculars
Attribution-NonCommercial-NoDerivs 3.0 Spain
Article - Draft

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