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<p>Visual discomfort and retinal damage might be belonging to exposure to harmful blue light from artificial lighting and digital screens. However, the blue light filtering lens (BLFL) presence compromises colour perception and visual clarity. Addressing disparities, this work presents the design and evaluation of a plasmonic BLFL (PBLFL) that reduces blue light transmission while maintaining high optical performance. However, nanoparticle layers SiO<sub>2</sub> have been inserted to add more protection to the plasmonic layer Ag. Using the Liou-Brennan eye model, the lens was simulated to assess its spectral transmission, diffraction encircle energy, merit function chromatic aberration, dispersion, RMS spot size, point spread function (PSF), chromatic focal shift, and modulation transfer function (MTF). The presented results were compared with and without using PBLFL. The results demonstrate that the PBLFL effectively blocks averaging approximately 25–30% of blue light in the (400–500 nm) range. Besides, BLFL achieves averaging 88–90% transmission in the visible spectrum (500–700 nm) with a slight drop to 87% near 700 nm, maintaining visual clarity and colour perception. Aberration coefficients were reduced with PBLFL, with only a slight increase at shorter wavelengths, and the RMS spot size analysis demonstrated an accurate reduction in the blue light and focusing for green and red light. The spherical aberration coefficients are reduced from 0.9320, 0.0328, 0.0068, 0.3828, and 0.0355 to 0.5320, 0.0321, 0.0064, 0.1523, and 0.0201 for spherical W<sub>040</sub>, astigmatism W<sub>222</sub>, distortion W<sub>311</sub>, lateral chromatic W<sub>020</sub>, and transverse chromatic aberrations W<sub>111</sub>, respectively. The MTF outcomes indicate that the lens keeps high contrast at lower spatial frequencies, providing image quality and sharpness for everyday tasks. This research is a milestone in the development of PBLFL. Besides, the design of this lens for the proposed aim ensures a balance between eye protection and high optical performance. Thus, the solution proposed will allow end-users to minimize blue light exposure without compromising comfort as contact lens and protective film layer.</p>

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Analysis of Optical Performance of Plasmonic Blue Light Filtering Lens for Eye Protection

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Zahraa S. Alshaikhli,
  • Maytham T. Mahdi

摘要

Visual discomfort and retinal damage might be belonging to exposure to harmful blue light from artificial lighting and digital screens. However, the blue light filtering lens (BLFL) presence compromises colour perception and visual clarity. Addressing disparities, this work presents the design and evaluation of a plasmonic BLFL (PBLFL) that reduces blue light transmission while maintaining high optical performance. However, nanoparticle layers SiO2 have been inserted to add more protection to the plasmonic layer Ag. Using the Liou-Brennan eye model, the lens was simulated to assess its spectral transmission, diffraction encircle energy, merit function chromatic aberration, dispersion, RMS spot size, point spread function (PSF), chromatic focal shift, and modulation transfer function (MTF). The presented results were compared with and without using PBLFL. The results demonstrate that the PBLFL effectively blocks averaging approximately 25–30% of blue light in the (400–500 nm) range. Besides, BLFL achieves averaging 88–90% transmission in the visible spectrum (500–700 nm) with a slight drop to 87% near 700 nm, maintaining visual clarity and colour perception. Aberration coefficients were reduced with PBLFL, with only a slight increase at shorter wavelengths, and the RMS spot size analysis demonstrated an accurate reduction in the blue light and focusing for green and red light. The spherical aberration coefficients are reduced from 0.9320, 0.0328, 0.0068, 0.3828, and 0.0355 to 0.5320, 0.0321, 0.0064, 0.1523, and 0.0201 for spherical W040, astigmatism W222, distortion W311, lateral chromatic W020, and transverse chromatic aberrations W111, respectively. The MTF outcomes indicate that the lens keeps high contrast at lower spatial frequencies, providing image quality and sharpness for everyday tasks. This research is a milestone in the development of PBLFL. Besides, the design of this lens for the proposed aim ensures a balance between eye protection and high optical performance. Thus, the solution proposed will allow end-users to minimize blue light exposure without compromising comfort as contact lens and protective film layer.