It is interesting how many people freak out when they hear about the vision sides, which are, perhaps the most innocent side effects of all PED's. All in all, the probability of suffering the vision side effect with just 25 mgs ED is quite minimal, so there is no need to worry. However, I would not use any more than 50 mgs - this is just the right dosage to use. A higher dosages will considerably increase the risk of the vision side effect, but the additional benefits will be minimal compared to what you get with 50 mgs. Besides, you will safe quite some money by using a moderate dosage.