The unblinking lenses of a spider’s two front-facing primary eyes do not move. Instead, to look at different things, the cone-shaped inside of the eye is shifted around by muscles.

The eyes are ... where the spider is looking at any given moment. This is similar in some ways to how eye tracking is done for humans, which also uses IR, but watches the position of the pupil.

The study, published in the latest Royal Society Biology Letters, presents a detailed look at how each of these spiders' eight eyes works ... a male Australian redback spider woos a female ...

Then, she hangs the stick with its spider in front of the eye tracker, the spider perched on a little ball facing a video screen. Once the spider is in position, Jakob plays videos.

transcript. How to Give a Spider an Eye Test Jumping spiders have excellent vision. To test it, scientists use a special machine of which there are only two in the world.

Biologists look to the past for early genetic development of tiny spider and insect eyes to find potential for research into human visual challenges. Share: Facebook Twitter Pinterest LinkedIN Email.