New method of measuring nuclear cataract in color Scheimpflug photographs

Based on the differential equation, a new method of measuring nuclear cataract in color Scheimpflug photographs was introduced. The densitometries for red, green and blue color were conducted simultaneously along the anteroposterior axis of the lens within the nuclear region. The 3 color components were subtracted from each other, yielding blue-red, green-red and blue-green curves which were linear within the nuclear region. The tangent values were calculated from the curves that correlate well with the degrees of nuclear cataract.