Cerebrotendinous Xanthomatosis (CTX) Prevalence Study

Inclusion Criteria:

1. The patient has a diagnosis of idiopathic bilateral cataracts

2. Between the ages of 2 to 21 years at the time of diagnosis

Exclusion Criteria:

1. The patient has a diagnosis of cataracts with known etiology other than CTX

2. The patient has a diagnosis of CTX

3. The patient has cataracts caused by cataractogenic treatments

4. The patient has taken or is currently taking cholic acid or chenodeoxycholic acid

5. The patient has participated in an interventional clinical trial in the past 30 days

6. The patient and/or their parent/legal guardian, in the opinion of the Investigator,is unable to adhere to the requirements of the study