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| Description: With your left eye closed, look at the plus sign with your right eye and move the page nearer to and farther from you. When the page is about 20 cm from your face, the green circle disappears because its image falls on the blind spot of your right eye.
Picture Stats: Views: 578 Filesize: 24.67kB Height: 427 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=21227 |