A biomedical optics engineer discovered a visual illusion where purple dots appear bluer in peripheral vision. This ...

Indiana University researchers have shown how to identify tens of thousands of genes all at once by using tiny semiconductor crystals that dazzle in ultraviolet light. The technique works like a bar ...

Do you have a hunch that you don’t see colors as clearly you should? Ever been told that something has different shades, but they all look the same to you? If so, you could be color blind. Some people ...

I read with interest the paper by FH Zaidi and colleagues titled ‘The Amsler chart is of doubtful value in retinal screening for early laser therapy of subretinal membranes’ (Eye 2004; 18: 503–508).