Highest hyperacuity
 
                                    
								- Who
- Dr Dennis M. Levi
- Where
- United States (College of Optometry, University of Houston.,)
- When
- April 1984
                        The human eye is capable of judging relative position with remarkable accuracy, reaching limits of between 3 and 5 seconds of arc. 
In April 1984, Dr Dennis M. Levi (USA) of the College of Optometry, University of Houston, Texas, USA, repeatedly identified the relative position of a thin bright green line within 0.85 seconds of arc. This is equivalent to a displacement of some 6 mm (0.25 in) at a distance of 1.6 km (1 mile).
                    										
                    In April 1984, Dr Dennis M. Levi (USA) of the College of Optometry, University of Houston, Texas, USA, repeatedly identified the relative position of a thin bright green line within 0.85 seconds of arc. This is equivalent to a displacement of some 6 mm (0.25 in) at a distance of 1.6 km (1 mile).
 
   
      