Evaluation of the performance of optical filters for ophthalmic use employing Euclidean distances
Main Article Content
Abstract
The lifestyle of today's societies involves the intensive use of LED screens. The light radiation emanating from these devices has a high spectral content in a region identified as phototoxic (approximately 380- 500 nm). Exposure to this type of radiation is in part responsible for “digital eye strain” and the alteration of circadian rhythms. Faced with this situation, a set of preventive and palliative measures have been suggested, among them, the use of glasses with the ability to filter phototoxic light.
The present work compiles, in Spanish language, relevant information on the problematic involved and, by employing Euclidean distances as criterion to differentiate spectra, presents and discusses the performance of different lenses available in the market in order to provide information as guidance on their potential effectiveness. Specific pigmented and transparent lenses (advertised as protective against excess of blue light) and non-specific pigmented (low cost) lenses were analyzed. Our results show that the specific transparent lenses tested do not present a significant degree of attenuation in the phototoxic region. On the other hand, the specific pigmented lenses generally have a very good attenuation while the non-specific ones have a moderate attenuation capacity.
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