US Patent 7703937 Hands free light emitting diode (LED) illumination device

A reading light ring including a battery powered LED as the source of illumination. The reading light ring is intended to be worn on the index finger and operated by means of a thumb operated switch located on the side of the ring. The light emitted by the LED is preferably blue to green in wavelength so as to improve visual acuity in low light environments while minimizing the impact on the human eye readjusting from lighted to dark conditions. The LED is positioned so as to direct most of its light at an angle which would allow the illumination of a document held in the device bearing hand and allow the LED to be shielded by the opposing hand. The device is preferably waterproof and shock resistant.