He could be part siamese. Siamese cat's eyes reflect red, not green- which
makes for some very scary photos!! Lol!!

I think it depends on the cat's eye colour. Blue-eyed cats like Siamese
have eyes that reflect differently than the more common yellow-green eyes
of your typical moggie.

Maybe it has something to do with the pigment in daylight?
My blue-eyed cats usually reflected red, but those with
"cat" colored eyes have reflected red, green or yellow
(Probably depending upon whether their eye color was really
green, or on the yellow or gray side.)

That was an interesting question. I had to do a search. Here's what I
found from this site http://dpfwiw.com/red-eye.htm#colors:   -Rhonda

Reflex Colors

The consistently red color of the human reflex derives from the red
blood pigment hemoglobin. Light from the flash picks up the red from
blood vessels encountered during its bounce off the retina, just as
reflected sunlight picks up the color of a red sweater.

Why, then, do animal reflexes come in so many other colors and seldom in
red? The answer lies in the tapetum lucidum, a highly reflective,
variably pigmented membrane backing the retina in animals with good
night vision (including dogs, cats and most domestic animals) but
entirely absent in humans. The tapetum lies directly behind the retinal
photoreceptors. Nova's The Nocturnal Eye nicely illustrates the anatomy.

The tapetum enhances low-light vision by giving retinal photoreceptors a
2nd crack at any incoming light that manages to escape absorption
(detection) on the first pass. In dogs, at least, an additional boost
may come from tapetal fluorescence, which shifts incoming wavelengths
into better alignment with the peak spectral sensitivities of the
photoreceptors. Tapetal pigments surely come into play here.

When tapetal pigment is present, its color dominates the color of a
given animal's reflex. Tapetal color loosely follows coat color. For
example, black coats and green reflexes tend to go together, as seen in
our border collie above. Most dogs and cats show a blue reflex as their
eyes mature in the first 6-8 months of life. Pigment-poor animals like
blue point Siamese cats with no tapetal pigmentation show a red reflex
for the same reason humans do.