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Transitions® Lenses and Blue LightTECHNICAL NOTES FOR EYECARE PROFESSIONALS
WHAT IS HARMFUL BLUE LIGHT?
Blue light (also known as High Energy Visible Light) is at the far end of the visible spectrum, close to ultraviolet light, with wavelengths of between 380-460 nanometers. Harmful blue light is centered around 435nm.1
Long term exposure to harmful blue light has been linked to increased risk of developing age-related macular degeneration (AMD) which is the leading cause of vision loss in adults over the age of 50.1, 2
Y-RAYS X-RAYS ULTRAVIOLET VISIBLE INFRARED MICRO-WAVES RADIOWAVES
100nm
UV
A
UV
B
IRA
315nm 1400nm 3000nm280nm
UV
A
nm
VISIBLE LIGHT
HEV380nm 460nm 780nm
03Transitions Lenses and Blue Light Technical Notes
COMMON SOURCES OF HARMFUL BLUE LIGHT
The amount of harmful blue light a person is exposed to varies based on several factors, including light source and viewing direction (Table 1).
Sunlight is by far the strongest source of blue light at least 100 times greater than artificial sources (Fig. 2).
SUN
3.71
IndirectVIEWINGDIRECTION
LCD MONITOR
.013
2 ft. facing
PLASMA TV
.035
6 ft. facing
CRT MONITOR
.025
2 ft. facing
SMART PHONE
.007
1 ft. facing
OVERHEAD FLUORESCENT
.089
6 ft. facing
04
Table 1Harmful blue light integrated Irradiance values (w/m2) of common artificial light sources against solar diffused light (Transitions Optical internal measurements)
PLASMA TV
SMART PHONE
LCD MONITOR
CRT MONITOR
WAVELENGTH (nm)
300 350 400 450 500 550 600 650 700 750 800
.014
.012
.010
.008
.006
.004
.002
0
HARMFUL BLUE LIGHTE
NE
RG
Y (
WA
TT
S/M
ET
ER
2/n
m)
WAVELENGTH (nm)
300 350 400 450 500 550 600 650 700 750 800
1.4
1.2
1
.8
.6
.4
.2
0
1 0 0 X P L A S M A T V2 7 0 X L C D M O N I T O R( 4 2 0 - 4 4 0 n m )
FACING THE SUN
AWAY FROM THE SUN
HARMFUL BLUE LIGHT
EN
ER
GY
(W
AT
TS
/ME
TE
R2/n
m)
05
Fig. 2Irradiance spectra of common artificial light sources (top) and direct and indirect sunlight (bottom) (Transitions Optical internal measurements)
Transitions Lenses and Blue Light Technical Notes
TRANSITIONS® ADAPTIVE LENSES
All Transitions lenses help protect against harmful blue light everywhere you need it.
Transitions® Signature® VII lenses block at least 20% of the harmful blue light indoors, which is up to 2 times more than standard clear lenses,* and they block over 85% outdoors.3
* Transitions lenses block 20% to 36% of harmful blue light indoors excluding CR607 Transitions Signature VII products which block 14% to 19%. The 2 times comparison refers to typical clear 1.50 and polycarbonate hard-coated lenses.
06
BLOCKS AT LEAST 20% INDOORS – UP TO 2X MORE THAN A CLEAR LENS*
BLOCKS OVER 85% OUTDOORS
07
Transitions® XTRActive® lenses help provide more protection than Transitions® Signature® VII lenses – they provide even more protection against blue light everywhere you need it by blocking at least 34% of the harmful blue light indoors, which is up to 3 times more than a standard clear lens,** and 88% to 95% of harmful blue light outdoors.3
BLOCKS AT LEAST 34% INDOORS – UP TO 3X MORE THAN A CLEAR LENS**
BLOCKS 88-95% OUTDOORS
** Transitions XTRActive lenses and Transitions® Vantage® lenses block 34% to 36% of harmful blue light indoors excluding CR607 Transitions XTRActive products which block 27% to 31%. The 3 times comparison refers to typical clear 1.50 and polycarbonate hard-coated lenses.
Transitions Lenses and Blue Light Technical Notes
08
Transitions® Vantage® lenses reduce exposure to harmful blue light, blocking at least 34%** indoors and over 85% outdoors.3
** Transitions® XTRActive® lenses and Transitions Vantage lenses block 34% to 36% of harmful blue light indoors excluding CR607 Transitions XTRActive products which block 27% to 31%. The 3 times comparison refers to typical clear 1.50 and polycarbonate hard-coated lenses.
BLOCKS AT LEAST 34% INDOORS – UP TO 3X MORE THAN A CLEAR LENS**
BLOCKS 88-95% OUTDOORS
100
80
60
40
20
0
TR
AN
SM
ITTA
NC
E
WAVELENGTH (nm)
350 400 450 500 550 600 650 700 750 800
UNACTIVATED BROWN LENS ACTIVATED BROWN LENS
UNACTIVATED GREY LENS ACTIVATED GREY LENS
HARMFUL BLUE LIGHT
TRANSITIONS® SIGNATURE® LENSES
100
80
60
40
20
0
TR
AN
SM
ITTA
NC
E
WAVELENGTH (nm)
350 400 450 500 550 600 650 700 750 800
UNACTIVATED BROWN LENS ACTIVATED BROWN LENS
UNACTIVATED GREY LENS ACTIVATED GREY LENS
HARMFUL BLUE LIGHT
TRANSITIONS® XTRACTIVE® LENSES
Fig. 3Overlay of un-activated and activated spectra of Transitions® Signature™ grey and brown lenses (top) and Transitions® XTRActive® grey and brown lenses (bottom)
09Transitions Lenses and Blue Light Technical Notes
Transitions® Signature® VII lenses filter a similar amount of harmful blue light indoors compared to many blue-filtering AR coatings and offer extra protection where you need it the most: outdoors in the sun. Transitions® XTRActive® lenses provide additional protection indoors compared to many blue-filtering AR solutions. Transitions lenses are compatible with many AR coatings that filter harmful blue light. When used together, these products may provide complementary benefits.
Fig. 5Matrix of blue light filtering delivered by optical solutions in the eyewear industry in normal indoor/outdoor usage
IND
OO
R
OUTDOOR
SUN LENSESSTANDARD
CLEAR LENSES
BLUE FILTERING AR COATING
YELLOW TINTEDLENSES
TRANSITIONS® XTRACTIVE®
TRANSITIONS® VANTAGE®
TRANSITIONS® SIGNATURE®
OPTICAL SOLUTIONS
10
1Arnault E., Barrau C., Nanteau C., Gondouin P., Bigot K., Viénot F., Gutman E., Fontaine V., VilletteT., Cohen-Tannoudji D., Sahel J., Picaud S., Phototoxic Action Spectrum on a Retinal Pigment Epithelium Model of Age-Related Macular Degeneration Exposed to Sunlight Normalized Conditions, PlosOne 8 (2013), DOI: 10.1371/journal.pone.0071398
2National Institutes of Health National Eye Institute. Facts about Age-Related Macular Degeneration. Retrieved from: https://nei.nih.gov/health/maculardegen/armd_facts
3Calculated using a weighted hazard function between 380-460nm
REFERENCES
www.Transitions.com
Transitions, the swirl, Transitions Signature, Transitions Vantage and XTRActive are registered trademarks of Transitions Optical, Inc., used under license by Transitions Optical Limited. Photochromic performance and polarization are influenced by temperature, UV exposure and lens material.