Highlights
- •Day-time blue light increase alertness in elder people with significant cataracts.
- •Cataract surgery can increase blue light transmittance.
- •Blue light perception can be beneficial for the health of elder people.
Abstract
Daytime blue light exposure can reduce fatigue and increase alertness in young healthy
adults. Little is known of the daytime blue light influence on alertness in elders.
A prospective with-in subject study was carried out in Peking University Third Hospital
to evaluate the impact of cataract surgery on visual functions and the electroencephalogram
alertness response to blue light stimulus before and after surgery. 14 participants
diagnosed with age-related cataract were scheduled for monocular cataract surgery
with ultraviolet-filtering intraocular lens (IOL) implantation. Best corrected visual
acuity (BCVA), color discrimination and electroencephalogram results were measured
before and after surgery. Exposure to blue light resulted in decreased delta (0.25–3.00 Hz)
activity and increased beta (13.25–30.00 Hz) activity both before and after cataract
surgery. Significant improvements in the BCVA and Farnsworth-Munsell-100-hue total
error scores were found after cataract surgery. The partial error scores in the red-yellow,
green blue-blue, and blue purple-purple red bands also showed significant differences,
with the green blue-blue band showing the most obvious improvement. Day-time blue
light stimulus can increase alertness in elderly people with significant cataracts.
Cataract surgery with ultraviolet-filtering IOL implantation can increase light, particularly
blue light transmittance. Opaque lens removal does not increase the alertness responses
to blue light 1 day after surgery. Nevertheless, the increase in light especially
blue light perception can be beneficial for the health of elder people in the long
run.
Keywords
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Article info
Publication history
Published online: September 11, 2018
Accepted:
August 13,
2018
Received:
April 19,
2018
Identification
Copyright
© 2018 Elsevier Ltd. All rights reserved.
