Review of the Light Shield "Red Eyes XTRA Dark Cling" (Sirius Astro Products)   Since using SkySafari, running on my two Sony Android smartphones, I was always annoyed by the amount of the grey-white LED backlight disturbing my night vision, even in Night Mode. Following the usual suggestions, I tried to block this backlight by using a deep red sheet of acryl, applying two layers. The results were not convincing, and I was always struggling with the stubborn sheets, when using the smar