The eyelid orbicular muscle is responsible for the occurrence of these wrinkles. When it contracts, the skin follows, leading to dynamic (movement) wrinkles, followed by static or ‘at rest’ wrinkles caused by the gradual breaking down of the skin’s elasticity as it follows the muscle.
The first injections can be done as soon as the patient feels embarrassed by these wrinkles.
As soon as the presence of wrinkles on the crow's feet, static or dynamic, begins to interfere with the person, injections are indicated. There are no side effects.