About Two Eyes 3D
Your eyes are about 6 cm apart, so each sees the world from a slightly different place, and your brain uses the difference to feel depth. In Two Eyes 3D, the balloons all look exactly the same size on the screen, so size can't help: only your two eyes working together can tell which one is closest.
With red-green, red-blue or red-cyan 3D glasses each eye gets its own picture, so near balloons float out of the screen and far ones sink in. Without glasses, hold Move your head: the view sways like looking out of a car window, and the nearest balloon moves the most. After every pick, a view from above shows where the balloons really were. Close one eye to feel the 3D disappear.
Depth match asks you to slide a pin to the same depth as a floating ring. The Why two eyes? page explains stereo vision, the finger jump test, other depth clues and lazy eye (amblyopia), and why young children should have their eyes checked. This is a game, not an eye test. Made by an eye doctor.
Best for ages 6+
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