[header] How to build near infrared goggles [title] Understand these goggles. [step] Human vision is most sensitive to light with wavelengths up to about 720 nanometers (red light). But if you filter out this " visible " light using these goggles, human eyes can pick up signals in the near infrared part of the spectrum, up to about 1 , 000 nm. 
Since our eyes can barely detect near infrared light, the goggles will only work in bright sunlight, or around another strong source of infrared light. They are not night vision goggles, but they will give you a weird new perspective on the world.