|
KMID : 1011420190240030309
|
|
Journal of Korean Ophthalmic Optics Society
2019 Volume.24 No. 3 p.309 ~ p.313
|
|
|
Physical and Optical Properties of Polarized Lenses
|
|
Kim Ha-Rim
Jeong Ju-Hyun
|
|
|
Abstract
|
|
|
Purpose: The purpose of this study was to investigate the optical and physical properties of different polarized lenses commercially available in Korea.
Methods: Optical (transmittance and reflectance) and physical (heat- and wear-resistance) properties were evaluated for six different polarized lenses. Transmittance was measured and divided into three blue-light regions. Heat-resistance was evaluated using the time taken by the coating layer to crack. Lenses were placed in a heater, which was pre-heated to 80oC, and the presence of cracks was assessed every 10 min. The wear-resistance test was performed with a pen scratch.
Results: All six samples showed a high ultraviolet (UV) blocking ratio in UVC (200-280 nm) and UVB (280-320 nm) regions, with transmittance of 0. Transmittance increased to 1.63% in the UVA (320-380 nm) region and gradually to 17.39% in the visible spectrum (VIS, 380-750 nm) region. Spectral luminance in the VIS (380-750 nm) region was 16.73-24.45%. Average reflectance in the VIS region (380-750 nm) was 4%. Time taken for the coating layer to crack was 120 min in the heat-resistance test.
Conclusions: All polarized lenses included in this study completely blocked UVC and UVB light. Average reflectance in the VIS region (380-750 nm) was 4.4%. Average pencil hardness was 6H, containing 250 g of graphite.
|
|
|
KEYWORD
|
|
|
Polarized lens, Transmittance, Blue light, Heat resistance, Wear resistance
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|