Are you having trouble falling asleep at night? Are you using your smart phone in the late evening? Are you used with late night chats? Then there's a great chance that you suffer from some eye problems.

Here, I am sharing an Android app named Twilight which helps you to keep your eyes strain free while staring continuously on your mobile phone display in the late evenings.

Developers of Twilight explain this case as following:

"Recent research suggests that exposure to blue light before sleep may distort your natural (circadian) rhythm and cause inability to fall asleep.
The cause is the photoreceptor in your eyes, called Melanopsin. This receptor is sensitive to a narrow band of blue light in the 460-480nm range, which may suppress Melatonin production - a hormone responsible for your healthy sleep-wake cycles.
In experimental scientific studies, it has been shown an average person reading on a tablet or smart phone for a couple of hours before bedtime may find their sleep delayed by about an hour.
The Twilight app makes your device screen adapt to the time of the day. It filters the blue spectrum on your phone or tablet after sunset and protects your eyes with a soft and pleasant red filter. The filter intensity is smoothly adjusted to the sun cycle based on your local sunset and sunrise times."

Note that it will be little difficult to start with Twilight as it changes the colour pattern of mobile display significantly, but be patient to get used with changes to protect your precious eyes.