Of course it is best to use the right eye drops, no matter what kind of price or what kind of brand, only the right eye drops for the right treatment is the best. For example, if you have bacterial conjunctivitis, you should use anti-bacterial eye drops. Anti-bacterial eye drops are available domestically and imported, cheap and expensive, and can be used. Like viral conjunctivitis, you have to use antiviral eye drops, like ganciclovir or antabuse eye drops, if you use antibacterial eye drops nothing works. In the case of fungal keratitis, of course, antifungal eye drops should be used, and antiviral or antibacterial eye drops are useless. If it is allergic conjunctivitis, if you use anti-allergic eye drops, such as nalmivir or emetine fumarate, etc.. If you use anti-bacterial or anti-viral eye drops, it will aggravate the symptoms.