A monocular depth cue is a visual clue that helps us understand how far away something is using just one eye. Even when we close one eye, we can still tell if an object is close or far. Examples of monocular depth cues include relative size (bigger objects look closer), occlusion (objects in front cover parts of objects behind them), and linear perspective (parallel lines seem to meet in the distance).
These cues are important because they help us move around and interact with our environment safely and accurately, even if we can't use both eyes together. Understanding monocular depth cues is part of studying how perception works in GCSE Psychology.
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