Depth Perception Test

What it measures

How accurately you interpret the everyday visual depth cues your brain uses to judge distance — relative size, overlap (occlusion), shadow and perspective — with an optional red-cyan trial that hints at binocular stereo vision.

How it works

You complete eight short, glasses-free trials. Each shows two or three shapes arranged with a single pictorial depth cue, and you choose the one that should appear nearest. These cues are monocular, meaning they work with just one eye and are exactly the signals artists and photographers use to imply depth on a flat surface. An optional bonus trial uses a red-cyan (anaglyph) image: a small square is drawn with a left/right offset between the red and cyan channels so it floats forward when viewed through anaglyph 3D glasses, giving a rough yes/no read on binocular stereopsis. We score your pictorial-cue accuracy and place it in a band, and report whether the stereo pop was seen.

Tips for an accurate result

• 1Trust the first impression — Depth cues are processed fast and automatically; your initial read is usually the right one, so don't overthink each trial.
• 2Reduce reflections — Glare and a dirty screen flatten contrast and can hide shadow and overlap cues, nudging your score lower than your real ability.
• 3Get a real stereo test if it matters — If precise depth vision is important for your work or hobby (driving, sport, surgery, fine assembly), ask an optometrist for a Randot or TNO stereo-acuity test measured in arc-seconds.
• 4Watch for one-eyed habits — If you tend to close or favour one eye, mention it to an eye-care professional — long-standing suppression or a turned eye can quietly reduce true stereopsis.