M
Major Scott
- Jan 1, 1970
- 0
A long long time ago when I was applying to study in Universities, a lecturer showed us a demonstration with a laser. As an aside, he told us to look at the pattern projected by the laser onto the wall and do something which I forget (move your head from side to side or something), and if the pattern stayed still you had 20-20 vision. Does anyone know the details?