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http://www.tftcentral.co.uk/articles/flicker_free_database.htm

Here’s a great website to find a list of monitors that don’t use PWM for dimming. PWM flickers the LED or Flourescent backlight at a rate barely perceptible, which causes the screen to appear dimmer. This causes extreme eye fatigue and possibly even neurological and nervous system issues.

Most monitors that use PWM can have the PWM bypassed by turning the backlight up to 100%. You might then have to lower the contrast quite a lot to make it a usable display. You can easily test how much your monitor is using PWM with a cheap camera phone. They generally show the flickering very easily.

Also something to watch out for is the color temperature. Blue LED light is particularity bad for the retina and can cause eye damage and most monitors default to a very blue light, something like 9300k. Try to lower your color temperature to a more neutral temp, I would recommend the industry stand D65 (6500k). This is what the film industry uses.

My brother had the Dell U27I3 and it was a beautiful monitor with no PWM flickering (I tested it).