I've read about the effects of nuclear blasts, etc when reading about Hiroshima/Nagasaki, so I was trying to find info I've read before. I haven't found exactly what I was looking for yet, but this could answer it.
From
Wikipedia:
QUOTE
Flash blindness is caused by the initial brilliant flash of light produced by the nuclear detonation. More light energy is received on the retina than can be tolerated, but less than is required for irreversible injury. The retina is particularity susceptible to visible and short wavelength infrared light, since this part of the electromagnetic spectrum is focused by the lens on the retina. The result is bleaching of the visual pigments and temporary blindness for up to 40 minutes.
A retinal burn resulting in permanent damage from scarring is also caused by the concentration of direct thermal energy on the retina by the lens. It will occur only when the fireball is actually in the individual's field of vision and would be a relatively uncommon injury. Retinal burns, however, may be sustained at considerable distances from the explosion. The apparent size of the fireball, a function of yield and range will determine the degree and extent of retinal scarring. A scar in the central visual field would be more debilitating. Generally, a limited visual field defect, which will be barely noticeable, is all that is likely to occur.
Now, I'm not expert. I'm a computer guy, not a doctor lol But the parts that stand out to me is the last sentence of the first paragraph and the retinal burning. Regarding the last sentence in the first paragraph, that's only for people who are looking directly at a blast and bleaching can occur? If that's the case, he was pretty darn close to it so I can see it lasting longer than 40 mins heh As far as the retinal burning goes, pictures I've seen the eyes had a yellow-ish look to them. From what I've read, retinal burning can occur within 25-75 miles of a blast, depending on its size.
I'm still researching more, I'll be back if I find more