If you use a computer in the field alongside your telescope you will know that the glare from the computer screen hampers your eyes' dark sky adaptation. In such circumstances many amateur astronomers place a red rubilith transparency in front of the computer screen to minimise the problem. This small program provides you with a Window that simulates that red rubilith transparency. The Window can be dragged anywhere over your screen and resized by dragging its borders in the usual way. You can change the intensity of the Window's colour and a number of different colours can be used if desired. The end result is that you can reduce the glare from all or part of your computer screen while still being able to view its content.
Night Vision Saver does not provide a perfect solution in that you cannot immediately access with your mouse other programs in the part of the screen that is overlaid by the simulated red rubilith transparency. Nevertheless by temporarily moving or minimising the Window you can regain access to those other programs and then, when ready, you can replace the Window to continue to preserve your night vision.
Night Vision Saver does not provide a perfect solution in that you cannot immediately access with your mouse other programs in the part of the screen that is overlaid by the simulated red rubilith transparency. Nevertheless by temporarily moving or minimising the Window you can regain access to those other programs and then, when ready, you can replace the Window to continue to preserve your night vision.
The intensity of the Window's colour is governed by sliding the provided button between the minimum and maximum settings. To change the Window's colour simply click one or other of the four sample colours displayed. The four arrow buttons allow you to position the adjustment controls on any side of the Window. You can also force the Window to remain on top of all other windows by clicking the button in the middle of the arrows.
In this example the Night Vision Saver window covers most of the imaging laptop's screen.