There really is no way that won't leave you worse off than before. Polishing glass takes several coarse to medium to fine grindings which are then followed by coarse to medium to fine polishing stages. Viewing glass usually requires polishing to 15,000 grit or finer. Any chips coming off scratch edges will cause new, and possibly large, scratches. Trying to polish tempered glass usually leads to crumbling glass. There are scratch maskers available that are sold to fill in scratches temporarily on eyeglasses. This might be a safer route to take.