This invention provides a better apparatus and method for the generation of Optical Coherence Tomography (OCT) and Confocal Scanning Laser Ophthalmoscope (CSLO) images, using a dual-waveguiding module. A dual-waveguiding structure consists of a single-mode and a multi-mode waveguide each with optimum size and numerical aperture for highly efficient collection of the OCT and CSLO optical signals. Separation of the two signals is achieved by channeling most of the multi-mode guided optical power to a CSLO detector. The non-tapped single-mode guided optical wave is further sent to a pure single-mode fiber of a standard OCT system for OCT image generation. The present invention achieves highly efficient optical power usage and hence high signal to noise ratio, together with inherent pixel-to-pixel registration of the OCT and CSLO images, and a cost reduction of the OCT/CSLO combo system.