Light for Night vision

株式会社ビクセン

About this app

The Light for Night Vision app allows you to use your smartphone as a flashlight of red color light during your session of astronomical observation.

When observing at night with a telescope, you adapt your eyes to the dark environment to perceive a faint celestial object in the field of view of your telescope’s eyepiece. As your eyes become accommodated to night vision, the pupils open widely to collect more light. You may occasionally want to check with a celestial map in the dark, or you may need to illuminate your finders and around to operate the telescope, a camera, and so on. In that situation, the illumination light of a white light flashlight will contract the pupil if it is used. As the result, you will have to wait a short while until the eyes are accommodated to the dark again.

The Light for Night Vision app helps you to keep the ability to see in reduced illumination in the dark by turning the screen on your smartphone into a red light flashlight. The intensity of the red light illumination can be varied brighter or dimmer by swiping up or down on the screen. The brightness setting adjusted is saved for next time use.

Ratings and reviews

Red screen with adjustable brightness. White mode available too. Very useful if you want red light from the screen of your phone. That is all it does. Exiting the app sometimes makes the screen brighter momentarily before the sensor brings it down, and that's annoying. But there are some android limitations here. So I point the phone away from my face when switching out of the app. Takes a little practice but worth the effort. Very happy I found this simple tool.

Very useful - Not many alternatives available for preserving night vision. But it could use some lockable presets, as it's rather easy to accidently adjust the brightness in the field with cold fingers. Also needs the ability to call / display over the lock screen. And keep it alive.

The problem is, there's no way I can see to turn it off without swiping up from the bottom of the screen to get the buttons to appear, brightening the screen! they need to add an off button onscree.

What’s new

Some bugs have been corrected.