Abstract
Purpose. Different IOL materials, particularly blue-light filtering materials, have different spectral transmittance characteristics. The color stimuli, which influence retinal receptors objectively, have consequently implications for color perception. We report on the quantitative determination of IOL-specific transmittance characteristics and present a method visualizing the resultant changes in color stimulus. Methods. A setup was realized to quantify IOL-absorption in a range of 390–780 nm. To visualize the influence of the different spectral transmittance characteristics an algorithm was developed, which converts RGB-pixel values of images into spectra, which performs the corresponding transmittance correction, reconverts to RGB, and reconstructs the image. IOLs of hydrophobic acrylate and hydrophilic acrylate with a hydrophobic surface in each case with/without blue-light filter were examined. Results. Assessment of the reference images verifies the suitability of the pipeline. Evaluation of the transmittance spectra reveals differences of material- and manufacturer-specifics, which are capable of inducing considerable changes in color perception, particularly in the blue color range and mixed colors involving blue. Conclusions. The developed technique provides an approach for determining IOL-specific transmittance behavior and subsequently its influence on the retinal color stimulus. Problems of altered color perception are occasionally reported after cataract surgery and these become obvious with the visualization procedure developed here.
Highlights
Color perception is a complex process in which a chain of signals consisting of physical, physiological, and psychological components evokes the actual impression of color
We report on the quantitative determination of intraocular lenses (IOLs)-specific transmittance characteristics and present a method visualizing the resultant changes in color stimulus
All lenses showed similar transmittance curves with more or less constant transmittance between 480 nm and 700 nm and a decline of 60% below 480 nm, except IOLs made from hydrophilic acrylate with a hydrophobic coating without blue-light filter
Summary
Color perception is a complex process in which a chain of signals consisting of physical, physiological, and psychological components evokes the actual impression of color. Cataract surgery using intraocular lenses (IOLs) with different spectral transmittance characteristics is known to affect the retinal color stimulus. This effect is to be expected in the light of previously published IOL transmittance curves [1,2,3], and yet its impact is difficult to quantify. The present study sets out to calculate the changes in color stimuli on the retina by quantitatively determining the spectral transmittance characteristics of IOLs made from different materials and supplied by different manufacturers. The main aim of this study was to understand how IOL implantation using different optic materials influences the retinal color stimulus
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