Hi Venita, Tint is the permanent color added to the lens. The effect of the tinted lens is thoroughly and only one tint color no matter indoor or outside. Now we have a light color tint and dark color tint. Light is about 20% tint and dark 80%. The dark tint lens is more suitable for working as sunglasses. kindly please check this link for the tint colors available https://www.firmoo.com/help-p-147.shtml. You can also check the step by step guidance on how to place an order: https://www.firmoo.com/help-p-42.shtml. I hope this is helpful. Thank you!