Angular dependence of the intensity of back scattered light from human lenses with nuclear cataract, implications for measurement

摘要

It is concluded that there is no angular dependence of back scattering of light from a nuclear cataract. This implicates that reading one meridian, e.g. the 90 deg, is enough for measurement of nuclear cataract with slit lamp microscopy with Scheimpflug projection. Altogether, ten patients with nuclear cataract were measured with the NIDEK EAS-1000 system in 6 meridians. There was a slight angular dependence fitting a second order polyomial with a maximum at 90 deg. In total, three different concentrations of standard scattering solution were measured with the same system at the same meridians. Also for these measurements, there was a slight angular dependence fitting a second order polynomial with the maximum at 90 deg. Thus, there is a system related factor that causes a slight change of intensity of back scatted light as function of meridian.