Patent ID: 8485664

Claim:
A reflectometry instrument to measure macular pigment of a macula of a human eye, comprising: a housing including a lower hand-held portion; an assembly of optical elements arranged within the housing to sequentially image the eye with multiple fields of view and to illuminate the eye with multiple light sources; an actuatable trigger having a first trigger switch position, a second trigger switch position and a third trigger switch position; a spectrally-modifiable light source for emitting an illumination beam in a direction toward the macula, the spectrally-modifiable light source providing a range of spectra depending on the position of the actuatable trigger; and a spectrometer for measuring one or more spectra measurements of a detection beam, the detection beam being reflected from the macula, each of the one or more spectra measurements being indicative of the amount of the macular pigment in the macula, and combining the one or more spectra measurements to result in a macular pigment optical density measurement.