|
KMID : 1011420200250010025
|
|
Journal of Korean Ophthalmic Optics Society
2020 Volume.25 No. 1 p.25 ~ p.32
|
|
|
Evaluation of Coloration and Discoloration of Photochromic Lensesby their Manufacturing Characteristics
|
|
Hwang In-Yeong
Kim Seung-Jun
Lee Kwang-Yeon
Kim So-Ra
Park Mi-Jung
|
|
|
Abstract
|
|
|
Purpose: In this study, the transition patterns of coloring and discoloring processes of photochromic lenses were separately compared and analyzed based on their manufacturing characteristics.
Methods: Photochromic lenses with different manufacturing characteristics of color, manufacturing processing method, and additional coating were exposed to UV rays and the color change was compared by taking photos every 5 seconds and 90 seconds for coloring and discoloring, respectively. The transition degree of the photochromic lenses was also analyzed by calculating the color concentration of those photos through the ‘Quantity One’ program; the coloring and discoloring speeds were further compared.
Results: The photochromic lenses were all colored within 40 seconds, regardless of the manufacturing characteristics; however, they were found to take up to 2,700 seconds to be discolored. In the case of photochromic lenses of the same manufacturing processing method, brown lenses showed faster coloring and discoloring than gray lenses and a higher coloring concentration. For the photochromic lenses of the same color, the lenses manufactured by a coating processing method showed faster coloring and discoloring as well as darker coloring than those manufactured by a monomer processing method. Photochromic lenses with additional mirror coating did not show enough additional coloring, as a sufficient amount of UV rays was not absorbed.
Conclusions: By analyzing the transition patterns of photochromic lenses from the time spent on coloring and discoloring, the effect of the characteristics by the manufacturing process on the pattern and speed of coloring and discoloring were revealed in this study. Therefore, it may be suggested that the selection of photochromic lenses requires consideration of the manufacturing characteristics according to the users’ vision lifestyle.
|
|
|
KEYWORD
|
|
|
Photochromic lens, Manufacturing characteristics, Color concentration, Coloring speed, Discoloring speed
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|