Tinted sunglasses are always used for Protection from harmful UV sunrays light and it is very much important to prevent the damage to the lens more than a style statement. With the enlarging of the size of the ozone hole, we are suffer from a greater risk when do outdoor activities. For this situation, wear tinted sunglasses is the best choice. Because Tints work by filtering light and each tint filters light differently. For example, The sodium yellow material (the color you mentioned) provides excellent contrast and depth perception in low intensity light. This is a great tint for skiers and shooter on overcast days. Grey is a neutral, general-purpose tint, popular with golfers, cyclists and runners. But grey does not enhance contrast. Brown provides good contrast in hazy sunshine and also suitable for anglers, sailors, skiers and in other sports where there is high-glare. Green is also a neutral, general-purpose tint that provides some contrast in low light and can help reduce eyestrain under bright lights. It can soften harsh bright light to relieve eye strain. So, according to this, you can choose tinted sunglasses which are suitable for you, don't limited to the yellow kind.