Do cats eyes absorb light?

Answers:
All eyes (cats, dogs, humans, flies, flatworms) absorb some light - they have to, in order to work. And most also reflect some light back, as well.

From Wikipedia (note step 5)

"How we see an object

The steps of how we see an object:

1. The light rays enter the eye through the cornea (transparent front portion of eye to focus the light rays)

2. Then, light rays move through the pupil, which is surrounded by Iris to keep out extra light

3. Then, light rays move through the crystalline lens (Clear lens to further focus the light rays )

4. Then, light rays move through the vitreous humor (clear jelly like substance)

5 . Then, light rays fall on the retina, which processes and converts incident light to neuron signals using special pigments in rod and cone cells.

6. These neuron signals are transmitted through the optic nerve,

7. Then, the neuron signals move through the visual pathway: Optic nerve 鈫?Optic Chiasm 鈫?Optic Tract 鈫?Optic Radiations 鈫?Cortex

8. Then, the neuron signals reach the occipital (visual) cortex and its radiations for the brain's processing.

9. The visual cortex interprets the signals as images and along with other parts of the brain, interpret the images to extract form, meaning, memory and context of the images. "

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every creatures eyes abosorb light, how else would they see?

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They absorb it but they also reflect.
http://www.hhmi.org/cgi-bin/askascientis.