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The visual perception of the natural night sky in many places of the world isstrongly disturbed by anthropogenic light. Part of this artificial light isscattered in the atmosphere and propagates towards the observer, adding to thenatural brightness and producing a light polluted sky. However, atmosphericscattering is not the only mechanism contributing to increase the visualskyglow. The rich and diverse biological media forming the human eye alsoscatter light very efficiently and contribute, in some cases to a big extent,to the total sky brightness detected by the retinal photoreceptors. In thispaper we quantify this effect and assess its relevance when the eye pupil isilluminated by light sources within the visual field. Our results show thatintraocular scattering constitutes a significant part of the perceived skybrightness at short distances from streetlights. These results providequantitative support to the everyday experience that substantial gains innaked-eye star limiting magnitudes can be achieved by blocking the direct lightfrom the lamps that reaches the eye pupil. Urban lighting designs that reducethe illuminance over the eye pupil and locate the sources at large angles withrespect to the visual axis are expected to help decreasing the artificialintraocular skyglow.

Skyglow inside your eyes: intraocular scattering and artificial brightness of the night sky