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Iris is software that can reduce the brightness of all monitors without PWM and without changing the backlight flicker-frequency or the current through the backlight. It does this by using the video card to move the white point of the monitor. This gives you a really big brightness reduction range.
Iris can also gradually adjust your screen brightness depending on the time of the day so your screen will match the light around you at night. Iris is a cheap and effective solution for reducing the negative effects of monitors with PWM flicker. By controlling the brightness without PWM, Iris helps with eye strain, dry eyes, and headaches caused by PWM flicker.
Some of the benefits of Iris are that Iris works even on docking stations and monitors connected with USB with the help of my custom High level Color-API. It has a much larger blue light reduction color range compared to all other alternatives, brightness without pulse-width modulation, manual settings, color effects, font rendering, magnification and partial screen blue light reduction with the help of full-screen overlays.
For your eyesight, you can try Iris, you will be happy.