![]() ![]() ![]() When you first turn off your bedroom light or step outside on a dark winter's night, you'll notice you can barely see anything.īut after about 30 minutes you'll be able to see objects much more clearly.This is because your eyes acclimatise to darkness over time. What is dark-adapted vision? Give your eyes a moment to adapt and you should start to see more stars. If you have an iPhone, however, you can set up a handy shortcut that will turn on a red filter, which is much more gentle on the eyes and helps preserve dark-adapted vision. ![]() Many stargazers and practical astronomers will be familiar with the situation: you spend 30 minutes at your favourite night-time observing spot, waiting for your vision to adapt to the dark so you can pick out more stars in the night sky, only to check your smartphone and ruin your precious night vision. How to turn your iPhone screen red for astronomy ![]()
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