Frequently Asked Questions

NightBirds do not use a polarized lens but rather, our proprietary dual-zone anti-glare lens to achieve superior results. So, what is this polarization thing about? Standard night driving glasses often feature a yellow lens that claims to use polarization to eliminate glare. The truth is these lenses are actually only partially polarizing for a limited portion of wavelengths of light, and furthermore, car headlights are "non-polarized" light sources means that there is no actual benefit to having a polarized lens to block glare. Polarized sunglasses work during the day because scattered light in the sky has a distinct polarization angle, but polarization during the night is not a beneficial feature.

Yes; we will ship the correct glasses to you order from a country where cars normally drive on the left-hand side of the road including the United Kingdom, Ireland and India.

NightBirds lenses reduce the intensity and discomfort caused by glare, however they are not a vision corrective device and cannot correct for visual artifacts such as stars or halos. It is common for blur, stars and halos to be worse at night due to the larger pupil dilation. You may benefit from wearing corrective glasses if you do not already - please consult with an optometrist for more information.

At night the average illumination is significantly reduced. To adjust, the pupil of our eyes dilates (gets bigger) to let in more light. However, the larger pupil size comes with a cost: reduced "depth of field" causing a general reduction of sharpness of vision. In addition the high contrast between lights (e.g. headlights) and surrounding darkness approximates the properties of a point source, which makes visible the point-spread function of our visual system - any imperfections in visual sharpness will appear as a blur spreading out from the light. For many people who do not normally wear glasses, it can be beneficial to wear glasses when driving at night.