Crows feet are caused by the excessive muscle tone of the eye closing muscle and lax, poor quality skin around the eyes; the excessive muscle tone can be reduced by Botox, whereas, the poor quality skin is improved by Fraxel re: pair through strong regeneration of collagen of the skin, to support and iron out the wrinkles of the skin. Horizontal lines under the eyes are caused by the excess poor quality skin. If there is too much excess skin, microscopic accurate CO2 laser excision of the skin remains the best alternative. Botox treatment for these lines is scientifically illogical.
Fraxel re: pair is the most effective treatment because of its tightening property. Such treatment may have a surprising bonus of mini- upper eye lift. Usually, only one treatment is required.