If you find it hard to gaze on white screen with black text. Then just try the opposite, ie make background colour darker (if not black) and foreground colour lighter.

For instance you can try this custom google search engine. It is same as google but with darker theme which really light on eyes.

Blackle also mention how much watts of energy has been saved by using it.

Since it uses dark colour for its theme, less number of pixels of your monitor are used and therefore less electrical energy is consumed, moreover it keeps your vision healthy. Otherwise, when we stare at a website like google search page, most of the pixel are lit and it like gazing at a bright light bulb which degrades vision.

Now if you want to try this on larger scale like making all web pages darker

Follow below mention steps (only for firefox users)

WARNING: THIS MIGHT DISTURB THE VISUALS OF WEBSITE.

  1. go to >>> Tool>Options>Contents
  2. There click on colours button under fonts option.
  3. Select darker colour for background and brighter for font.
  4. Uncheck -> Use system colours and Allow pages to choose their own colour
  5. OK and OK