One of the most important manufacturing processes is surface modifying. In this work the common techniques for polishing glass and specially Fluid jet polishing and Abrasive slurry jet (ASJ) techniques were described. Also the theories of material removal from the surface were stated. Experiments were carried out on glass specimens under different parameters such as system pressure, nozzle feed rate, jet impact angle and nozzle stand-off distance by a direct ASJ machine. The surface roughness parameters Sa, Sdr, Sdq and Ssc were measured and calculated using an optical non-contact 3D profiler. The visual appearance of the specimens was graded as well. The visual appearance grades were plotted versus Sa,Sdq,Sdr and Ssc values and the correlation between them were discussed. Also the values of system parameters were plotted versus visual grades, Sa,Sdq,Sdr and Ssc and the effects were discussed.