Why HID Headlights Bother Older Drivers. Br J Ophthalmol 2003 Jan;87(1):113-7
Mainster MA, Timberlake GT.
"Glare...is worse for older drivers because of their increased intraocular light scattering, glare sensitivity, and photostress recovery time." Full study
Alternative Treatments for Sleep Maintenance Insomnia in the Elderly:
White Light VS. Green Light. Sleep 1999; Vol 22 Supplement: S263
Philip Gehrman, Jennifer Martin, and Sonia Ancoli-Israel.
"Some subjects complained of the intensity of the white light. The green light (Sunnex Biotechnologies Lo-LIGHT) has less glare, so the greater effectiveness of this treatment may be due to the subjects having greater tolerance and therefore being more compliant." Abstract