A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, converging or diverging the beam.

Wearing colored contact lenses has become fashionable among youngsters in Laos. More and more young people from schools and colleges are buying them, believing they give them more beautiful eyes. The new trend however has a serious downturn: if the colored lenses are not kept clean it can lead to a variety of eye infections.

Doctors are therefore urging the youngsters to think before following the new fashion trend. “Lenses are difficult to keep clean, especially when wearing them in dusty conditions. Treatment for eye infection is expensive and involves discomfort.”