LENS - Long-term Eltrombopag Observational Study

Inclusion Criteria: Subjects are eligible for enrolment in the study if they have previously participated in an eltrombopag study, either phase II or III, and meet all of the following criteria: * Subject has signed and dated a written informed consent for this study. * Subject has previously participated in a study evaluating eltrombopag, either phase II or III, and must have received at least one dose of study medication (either active drug or placebo). This excludes subjects from phase I studies (See Section 5.1). * The prescribed follow-up ophthalmic assessment at 6 months post end of treatment should be completed as specified in the protocol for the previous study. * Subject is able to understand and comply with protocol requirements and instructions. Exclusion Criteria: Subjects meeting any of the following criteria must not be enrolled in the study: * Subject has received surgery for cataracts and is aphakic or bilaterally pseudophakic. * In some countries (i.e. France), a subject is neither affiliated with nor a beneficiary of a social security category.