Table 2.

Traditional experimental paradigms for studying the two subtypes of photochemical damage from visible light (Ham et al. 1979, Kremers and van Norren. 1988, Noell et al. 1966, Thumann et al. 1999, van Norren and Gorgels. 2011, Williams and Howell. 1983)

Property	Noell Damage	Ham Damage
Class	I	II
Exposure duration	> 1.5 hours	< 5 hours
Source spectrum	green-filtered fluorescent & incandescent white	white & laser lines
Primary animal species	rats	primates
Exposure Size	large	small
Site of major impact	Photoreceptors, occasionally RPE	RPE
Action spectrum	resembles visual pigment absorption	peaks in UV