Chromoretinoscopy and its instrumentation

Transmittance filters with selected dominant wavelengths, when placed in the light path between the light source of a retinoscope and the retinoscopist's eye, make possible a clinical measurement of the chromatic aberration of an eye. This kind of retinoscopy (chromoretinoscopy) also determines the approximate wavelength in focus in the retinal plane, when an eye is fixating an object at some distance. For laboratory purposes, these measurements can be considerably refined when a high intensity monochromator is used as the retinoscope's light source and care is taken to fix the subject's accommodation.