Sarah McDaniel breaks the lens thanks to the different colored eyes: the right one is yellow-brown, the left one is blue.
It is called heterochromia iridum, a somatic characteristic that affects one percent of people and other animals such as cats.
During the early days during the casting someone “dared” to speak of a defect. Then she had to fight on charges related to the use of a contact lens. Now she is affirming herself also because the chromatic difference of the eyes is not really what attracts looking at her photos