An ophthalmic imaging system for imaging an axial and lateral point-spread of light distribution pattern of light reflected from a surface of an animal or human eye includes an ophthalmic imaging apparatus adapted to generate an illumination light of a surface of the eye. A detection arm includes a digital micromirror device (DMD) having an array of mirror facets. A first detector is disposed to receive a first portion of the axial and lateral point-spread of light distribution of light, and one or a plurality of additional detectors are disposed to receive a light from one or a plurality of different portions of the axial and lateral point-spread of light distribution pattern of light. A detection arm, a method for imaging axial and lateral point-spread of light distribution components, and a method for auto-centering a distribution pattern in an imaging plane of a DMD device are also described.