Light distortion and ocular scattering with glistening and aberration-free pseudophakic IOL: a pilot study

• Autores: J. Salgado Borges, Libânia Dias, Joana Costa, Helena Neves, Sofia C. Peixoto de Matos, José Manuel González-Méijome
• Localización: Journal of Emmetropia: Journal of Cataract, Refractive and Corneal Surgery, ISSN-e 2171-4703, Vol. 6, Nº. 3, 2015, págs. 127-132
• Idioma: inglés
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• Resumen

  • PURPOSE: To evaluate two different methodologies for measuring intraocular light scattering and light disturbances in pseudophakic patients implanted with a monofocal aspheric intraocular lens (IOL).

    SETTING: Clínica Oftalmológica Salgado Borges, Porto, Portugal.

    METHODS: Eighteen consecutive patients (mean age: 70 ± 7 years, range: 60 to 86 years) with cataract were bilaterally implanted with an aspheric monofocal IOL (enVistaTM, Bausch & Lomb) by the same experienced surgeon. Examinations were performed 5 to 8 months after surgery. Objective ocular scattering index (OSI) for a 4 mm pupil, as well as other parameters related to the quality of vision through the ocular-IOL optical system were evaluated with the HD Analyzer® (Visiometrics, Spain) under non-dilated conditions. Light disturbances were evaluated with a prototype device (Light Distortion Analyzer [LDA], University of Minho, Portugal).

    RESULTS: Average lens power was 21.40 ± 2.34 D, with a post-operative spherical equivalent refractive error of 0.14 ± 0.51 D of sphere and −0.18 ± 0.51 D of cylinder. Median value (minimum, maximum) for the OSI was 1.30 (0.3, 7.9), and for the light distortion index (LDI) was 23 (11.30, 90.80). LDI was positively correlated with the OSI (Rho = 0.563;

    p = 0.015), and negatively correlated with the modulation transfer function (MTF) cutoff frequency (Rho = 0.467; p = 0.049).

    CONCLUSIONS: The HD Analyzer® and LDA may help in identifying tear film problems that could increase the overall OSI index in post-surgical patients undergoing cataract extraction with IOL implantation. Both instruments provide different information about the optical quality perceived by the patient.