Evaluation of Fading Rate of Photochromic Lenses in Domestic Market

유동식,; Cho, Hyun Gug; 문병연,

doi:10.14479/jkoos.2017.22.1.23

Cited by 3 publications

(8 citation statements)

References 12 publications

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“…The BR was used to evaluate how well the photochromic lenses performed as anti-glare sunglasses. The BR max1 at λ max1 , on average, was 74.6% (range: 52.3-89.2%) at the cold and 62.8% e 4T mean : the difference in the mean value of transmittance measured in the visible region, and values at warm temperature are data derived from our previous study [20].…”

Section: Optical Properties Of Photochromic Lensesmentioning

confidence: 77%

“…In addition, the fading rate can be evaluated by the T 80% as the fading time until 80% transmittance, corresponding to very lightly tinted sun-glare filters, at λ max1 is reached [20].…”

Section: Plos Onementioning

confidence: 99%

“…The difference in transmittance (ΔT max1 ) between the colorless and colored states at λ max1 , on average, was 68.4% (range: 47.5-83.4%) at the cold and 58.3% (range: 36.5-72.6%) at the warm temperature. The difference in the mean value of transmittance (ΔT mean ) measured in the visible region, on average, was 42.0% (range: 30.0-51.0%) at the cold and 34.1% (range: 23.0-45.9%) at the warm temperature [20]. The ΔT (ΔT max1 and ΔT mean ) at the cold temperature was 1.2 times higher than that at the warm temperature, being 10.1% higher at λ max1 and 7.9% higher in the visible region.…”

Section: Optical Properties Of Photochromic Lensesmentioning

confidence: 99%

“…g BR mean : optical blocking % ratio of 4T% to colorless state based on the mean value measured in the visible region, and values at warm temperature are data derived from our previous study [20].…”

Section: Optical Properties Of Photochromic Lensesmentioning

confidence: 99%

“…Therefore, the fading rate is an important factor in photochromic lens selection. In our previous studies [19][20][21], we investigated the optical characteristics and fading rates of photochromic lenses prepared by hard coatings and of marketed photochromic lenses, and suggested that manufacturers should provide consumers and agents with correct photochromic information regarding the fading rate. These fading rates in the above studies were evaluated at a temperature of 21 ± 2˚C, similar to the 23 ± 2˚C of ISO 8980-3 [22].…”

Section: Introductionmentioning

confidence: 99%

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Differences in the optical properties of photochromic lenses between cold and warm temperatures

Moon

Kim

2020

PLoS ONE

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The aim of our study was to quantitatively evaluate the optical properties of photochromic lenses available on the market under cold and warm temperatures corresponding to the winter and summer seasons. The transmittance of 12 photochromic lenses from five manufacturers was measured using an UV/VIS spectrophotometer at cold (6 ± 2˚C) and at warm (21 ± 2˚C) temperatures. Transmittances were recorded from 380 to 780 nm and at the wavelength with maximum absorbance, which was calculated from the transmittance. The characteristics of the lenses were evaluated by examining changes in the optical properties at colorless and colored states and in the fading rate depending on temperature. The wavelength with maximum absorbance for photochromic lenses at the cold temperature showed a shorter shift than that at the warm temperature. The photochromic properties at the cold temperature were 11.5% lower for transmittance, 1.4 times higher for the change in optical density, and 1.2 times higher for the change in transmittance in the colored and colorless states, optical blocking % ratio, and change in luminous transmittance as compared to those at the warm temperature in the colored state. The fading rates based on the half-life time at the cold temperature were from 2.7 to 5.4 times lower than those at the warm temperature. The fading time until 80% transmittance was 6.4 times longer at the cold as compared to that at the warm temperature. There were significant differences in the optical properties of the photochromic lenses in terms of an absorbance at a shorter wavelength, a lower transmittance, a higher optical density, optical blocking % ratio, and luminous transmittance at the cold as compared to the warm temperature. Hence, it is necessary to provide consumers with information on photochromic optical properties, including the transmittance in colored and colorless states, and the fading rates at temperatures corresponding to the summer and winter seasons for each product.

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Section: Optical Properties Of Photochromic Lensesmentioning

confidence: 77%

“…In addition, the fading rate can be evaluated by the T 80% as the fading time until 80% transmittance, corresponding to very lightly tinted sun-glare filters, at λ max1 is reached [20].…”

Section: Plos Onementioning

confidence: 99%

Section: Optical Properties Of Photochromic Lensesmentioning

confidence: 99%

Section: Optical Properties Of Photochromic Lensesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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