The color blind among you might have noticed that the Universal Access section in Preferences allows you to invert colors on your Mac. Nocturne performs a similar task, however giving you a bit more flexibility.
Accessible from your menu bar, Nocturne lets you switch quickly between what it calls day and night vision. Even if you aren't color blind, you'll notice that night vision is much easier on the eyes when using Nocturne in a low light environment.
Nocturne's preferences can be played around with to customize day and night vision according to your needs. You can disable shadows and your desktop and create your own night vision by selecting two tints from the full color spectrum. You can also leave it in plain black and white.
Nocturne also lets you invert hue and screen. Give it a try to see what feels best for you. I felt the brightness adjustment slider was a bit limited though and couldn't really find a significant difference either way I set it.
Nocturne is a bit more advanced than the color inversion features found in Universal Access.
Light sensors support on MacBook Pros
Invert hue and screen
Disable shadows and desktop
Limited brightness adjustment
I work usually late in the evening with only a little ambient light in the office. Touch typing works perfectly without too much light on the keyboard and any superfluous light from the monitor is very distracting and starts to hurt on the eyes after a while. Unfortunately is the lowest setting for my Mac’s back-light still way to bright. With Nocturne I have two favourite options:
a) Inverted, dark with a little colour in the text mark-up when I am writing long texts without reading anything on-line or from paper.
b) Not inverted, considerably brighter with tinted display (red or green) when it's not that dark and/or I need to read something during work.
My eyes love nocturne B-)
Free, stable, does exactly what it is supposed to, lots of options to tinker with