Yes, it could be better. Transition glasses are specially treated to react to the amounts of UV lights. In general, the higher the UV light level, the darker the lenses become. That is to say, transition lenses prevent UV lights to damage eyes. And it is enough for wearer to carry one pair of glasses because transition glasses have both functionality of glasses and sunglasses. Of course they also are cost effective as well. Additionally, they have specific protection for eyes, that is to say, the protection degree of trainsition glasses can be differ based on the amount of sunlight. For example, they would be darker in bright days, and would be less dark in cloudy days. At the same time, they could protect eyesight, especially the retina.