Comparative Evaluation of Ultraviolet and Visible Light Transmittance through Prescriptive Ophthalmic Minus Lenses
<h2><strong>Background: </strong>Wearing spectacles is the most common approach in correcting the refractive errors worldwide. Due to harmful effects of overexposure to solar ultraviolet radiations, the usage of multi-layer coatings in ophthalmic lenses has recently been increased....
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Shahid Beheshti University of Medical Sciences
2014-06-01
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doaj-a8d2f256b44144b18c4d75a579819f8b2020-11-25T02:43:14ZengShahid Beheshti University of Medical SciencesNovelty in Biomedicine2345-33462345-39072014-06-012296724111Comparative Evaluation of Ultraviolet and Visible Light Transmittance through Prescriptive Ophthalmic Minus LensesMohammadreza Nazari0Saeed Rahmani1Bahram Khosravi2Seyyed Mehdi TabatabaeiDepartment of Optometry, Faculty of Rehabilitation Sciences, Shahid Beheshti University of Medical Sciences, Tehran, IranDepartment of Optometry, Faculty of Rehabilitation Sciences, Shahid Beheshti University of Medical Sciences, Tehran, IranDepartment of Optometry, Faculty of Rehabilitation Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran<h2><strong>Background: </strong>Wearing spectacles is the most common approach in correcting the refractive errors worldwide. Due to harmful effects of overexposure to solar ultraviolet radiations, the usage of multi-layer coatings in ophthalmic lenses has recently been increased. These lenses can reduce the reflections and hence increase the transmission of visible light; they can also decrease the transmission of ultraviolet rays. This study aims to compare the transmission of ultraviolet (A and B) and visible rays through coated and uncoated prescriptive ophthalmic plastic lenses.</h2><p><strong>M</strong><strong>aterials and Methods: </strong>In this study, 39 minus non-photochromic multi-coated white plastic single-vision lenses; 9 similar lenses but without any coatings were assessed by spectral transmittancemeter for evaluation of the transmission of visible and ultraviolet rays.</p><p><strong>R</strong><strong>es</strong><strong>ults: </strong>The transmission of visible light was 97.9%±1.07% for coated lenses and 93.5%±0.54% for lenses without coating. Ultraviolet-A transmission was 12.15%±8.02% for coated lenses compared to 66.27%±23.92% in lenses without coating. The transmission of ultraviolet-B rays was 1.21%±0.4% and 23.0%±15.97% for lenses with and without coatings, respectively.</p><p><strong>C</strong><strong>onclusion: </strong>The transmission of visible light was significantly higher in multi-coated lenses compared to uncoated samples; whereas the transmissions of ultraviolet rays in multi-coated lenses were significantly lower than uncoated ones. Therefore, it is recommended that, except for particular cases, prescribed lenses be equipped with this multi-layer coating.</p>http://journals.sbmu.ac.ir/index.php/nbm/article/view/5985Plastic lensvisible lightultraviolet radiation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Mohammadreza Nazari Saeed Rahmani Bahram Khosravi Seyyed Mehdi Tabatabaei |
spellingShingle |
Mohammadreza Nazari Saeed Rahmani Bahram Khosravi Seyyed Mehdi Tabatabaei Comparative Evaluation of Ultraviolet and Visible Light Transmittance through Prescriptive Ophthalmic Minus Lenses Novelty in Biomedicine Plastic lens visible light ultraviolet radiation |
author_facet |
Mohammadreza Nazari Saeed Rahmani Bahram Khosravi Seyyed Mehdi Tabatabaei |
author_sort |
Mohammadreza Nazari |
title |
Comparative Evaluation of Ultraviolet and Visible Light Transmittance through Prescriptive Ophthalmic Minus Lenses |
title_short |
Comparative Evaluation of Ultraviolet and Visible Light Transmittance through Prescriptive Ophthalmic Minus Lenses |
title_full |
Comparative Evaluation of Ultraviolet and Visible Light Transmittance through Prescriptive Ophthalmic Minus Lenses |
title_fullStr |
Comparative Evaluation of Ultraviolet and Visible Light Transmittance through Prescriptive Ophthalmic Minus Lenses |
title_full_unstemmed |
Comparative Evaluation of Ultraviolet and Visible Light Transmittance through Prescriptive Ophthalmic Minus Lenses |
title_sort |
comparative evaluation of ultraviolet and visible light transmittance through prescriptive ophthalmic minus lenses |
publisher |
Shahid Beheshti University of Medical Sciences |
series |
Novelty in Biomedicine |
issn |
2345-3346 2345-3907 |
publishDate |
2014-06-01 |
description |
<h2><strong>Background: </strong>Wearing spectacles is the most common approach in correcting the refractive errors worldwide. Due to harmful effects of overexposure to solar ultraviolet radiations, the usage of multi-layer coatings in ophthalmic lenses has recently been increased. These lenses can reduce the reflections and hence increase the transmission of visible light; they can also decrease the transmission of ultraviolet rays. This study aims to compare the transmission of ultraviolet (A and B) and visible rays through coated and uncoated prescriptive ophthalmic plastic lenses.</h2><p><strong>M</strong><strong>aterials and Methods: </strong>In this study, 39 minus non-photochromic multi-coated white plastic single-vision lenses; 9 similar lenses but without any coatings were assessed by spectral transmittancemeter for evaluation of the transmission of visible and ultraviolet rays.</p><p><strong>R</strong><strong>es</strong><strong>ults: </strong>The transmission of visible light was 97.9%±1.07% for coated lenses and 93.5%±0.54% for lenses without coating. Ultraviolet-A transmission was 12.15%±8.02% for coated lenses compared to 66.27%±23.92% in lenses without coating. The transmission of ultraviolet-B rays was 1.21%±0.4% and 23.0%±15.97% for lenses with and without coatings, respectively.</p><p><strong>C</strong><strong>onclusion: </strong>The transmission of visible light was significantly higher in multi-coated lenses compared to uncoated samples; whereas the transmissions of ultraviolet rays in multi-coated lenses were significantly lower than uncoated ones. Therefore, it is recommended that, except for particular cases, prescribed lenses be equipped with this multi-layer coating.</p> |
topic |
Plastic lens visible light ultraviolet radiation |
url |
http://journals.sbmu.ac.ir/index.php/nbm/article/view/5985 |
work_keys_str_mv |
AT mohammadrezanazari comparativeevaluationofultravioletandvisiblelighttransmittancethroughprescriptiveophthalmicminuslenses AT saeedrahmani comparativeevaluationofultravioletandvisiblelighttransmittancethroughprescriptiveophthalmicminuslenses AT bahramkhosravi comparativeevaluationofultravioletandvisiblelighttransmittancethroughprescriptiveophthalmicminuslenses AT seyyedmehditabatabaei comparativeevaluationofultravioletandvisiblelighttransmittancethroughprescriptiveophthalmicminuslenses |
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