So Owlet-nightjars don't have this Tapetum Lucidum?
I assume putting the torch closer to your eyes to help see the fainter shine
uses the same principal as moving a camera flash further from the lens to
reduce red-eye.
Peter Shute
Sent from my iPad
> On 18 Nov 2013, at 4:55 pm, "Andrew Hobbs" <> wrote:
>
> The colour of the eye reflection from the Tapetum Lucidum depends upon
> the properties of the crystals in the layer. It can vary more or less
> across the full visible spectrum. However in animals without that layer
> the reflection is always red. The red colour is mainly due to the
> haemoglobin in the blood vessels at the back of the eye. (This is the
> basis for the red eye effect in people. We don't have a Tapetum Lucidum.
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