I am in the process of building a device that will track eye movement via a camera. To light the eye I am using an array of infrared LED's and my camera is sensitive to IR light.
After using the device for several hours today (testing and the like) I have noticed a slight headache similar to eye strain but only in the eye that I have been testing with.
My quesion is as my eye is constantly having a bright IR light shone in it, but I can't percieve it as it outside of my visual spectrum, are there still parts of my eye that are sensitive to this kind of light and might be strained/damaged by this?
It could very well just be a normal eyestrain headache (as I am sat at a computing while doing this work) but I would rather be armed with more information before I continue this work (as this product might be tested on people other than myself)
The light being sent out has a wave length of 940 nm