Digital slit-lamp microscope is mainly used in the examination of ophthalmic diseases. The front objective lens is one of the important parts of the digital slit-lamp microscope, which affects the imaging quality of the entire system. Based on the parallel optical path principle of the stereo microscope, a high-performance front objective for a digital slit-lamp microscope is designed and optimized by using the Zemax software. Experimental results show that the maximum root mean squared radius of a spot diagram under low and high magnifications are 2.3 and 5.1 μm, respectively. At a spatial frequency of 115 lp/mm, the modulation transfer function (MTF) value of the full field of view under low magnification reaches 0.30, which is close to the diffraction limit and has a high resolution. Under high magnification, the MTF value is above 0.15, which meets the requirements of ophthalmology. Finally, further analysis the effect of eccentricity on the coma and astigmatism introduced by the system, providing a theoretical basis for machining and adjustment.