Measurement by laser Doppler interferometry of intraocular distances in humans and chicks with a precision of better than ±20 μm

A laser Doppler interferometer was built for the precise measurement of intraocular optical distances in humans and chicks. A technique using Purkinje images was developed to position the chick's eye reproducibly. A computer algorithm for the objective analysis of the interference signal and determination of the optical distances is presented. The precision of this noncontact interferometric method for measuring the cornea–retina distance is better than ±20 μm.